Metal Valve Manufacturing (United States) — NAICS 33291

A rollup investor's primer. This level combines four child industries; its distinctive value is the contrast among them. Figures are reported facts with citations; statements about the future are labeled as expectations or judgments.

NAICS (North American Industry Classification System) is the U.S. government's standard for grouping businesses by what they make. Code 33291 is the industry group that gathers everything the federal statistics call a "metal valve" — from a refinery isolation valve to a hydraulic spool valve to a kitchen faucet to a lawn-hose nozzle. It contains four child industries: 332911 Industrial Valve, 332912 Fluid Power Valve and Hose Fitting, 332913 Plumbing Fixture Fitting and Trim, and 332919 Other Metal Valve and Pipe Fitting [1].

1. Overview

A valve is the on/off switch and the dial of the physical economy — it starts, stops, throttles, and protects the flow of liquids, gases, steam, and air. This industry group makes the metal ones. But grouping them together hides how different the four businesses are. They share a raw material (brass, bronze, iron, steel, and nickel alloys) and a common trait (nearly all demand is "derived" — it follows the machines, buildings, and infrastructure the valve goes into), and then they diverge sharply on customer, cycle, concentration, and ownership.

Two of the children (Industrial Valve and Other Metal Valve) are fragmented, business-to-business, infrastructure-and-energy industries with a long tail of small foundries and machine shops. One (Fluid Power) is a cyclical capital-goods industry that tracks construction and factory-machinery build rates. And one (Plumbing Fixture Fitting and Trim — faucets and shower trim) is a branded consumer oligopoly that behaves more like a housing-linked consumer-products business than a metal-bashing one. An investor who buys "valves" without knowing which of these four they are buying is making four different bets at once.

The single most important fact for an investor: there is no scaled U.S.-listed pure-play in any of the four. Every one of them reaches public markets only as a segment inside a larger diversified company, and each is heavily populated by private, family, foreign, or private-equity (PE) owners. Where the value concentrates — and how you actually buy it — differs by child, and that is what this primer maps. Tickers, margins, and specific routes are reserved for sections 4 and 10.

2. What's inside — the four children and how they differ

The federal data draws sharp lines between the children, and those lines matter because a single company (Parker, Emerson, Watts, Mueller) usually straddles several codes, so no company's financials ever line up with one NAICS box [1]. The scope in one line each:

• 332911 Industrial Valve — gate, globe, ball, butterfly, plug, check, control, safety, solenoid, and relief valves, plus steam traps and complete fire hydrants, for pipelines, refineries, power plants, chemical plants, and municipal water systems [2].
• 332912 Fluid Power Valve and Hose Fitting — hydraulic and pneumatic valves plus the fittings, couplings, quick-disconnects, and hose assemblies that carry pressurized fluid inside machinery; the cylinders (333995) and pumps/motors (333996) on either end sit outside the code [3].
• 332913 Plumbing Fixture Fitting and Trim — faucets, shower heads, flush valves, spigots, drains, and supply-line trim: the plumbing parts people touch and turn. The sinks, tubs, and toilets themselves are elsewhere [4].
• 332919 Other Metal Valve and Pipe Fitting — the "everything-else metal" bucket: pipe flanges, inline plumbing/heating valves (check, cutoff, stop), aerosol valves, hose couplings, fire and lawn nozzles, sprinklers, and water traps [5].

Contrast table (the heart of this rollup)

Four contrasts deserve emphasis:

1. Concentration is wildly uneven. Faucets (332913) are a tight oligopoly — the top four firms make 63.9% of shipments and the top eight 83.1% [4]. The other three are "unconcentrated": Industrial Valve's top four hold 22.6% (top eight 36.1%), Other Metal Valve's 21.1% (top eight 32.4%), Fluid Power's 38.4% (top eight 50%) [2][3][5]. So the group's low aggregate concentration (section 3) masks one child that is anything but.
2. Labor intensity differs. Fluid Power employs almost as many workers as Industrial Valve (~31,100 vs 34,046) on ~24% less revenue — it is more labor-heavy per dollar. Faucets are the opposite: ~$6.60B of shipments on just ~9,069 U.S. factory workers, because so much value is brand and so much production is offshore [2][3][4].
3. So does pay. Average annual payroll per worker runs ~$75,000 in Fluid Power, ~$70,000 in Other Metal Valve, and only ~$63,700 in faucets, against a group average of ~$74,300 [3][4][5][6]. The group average sits above three of the four because the largest child, Industrial Valve, carries $2.66 billion of payroll across 34,046 workers — the highest-paid of the four [2].
4. Ownership type is the real fork. Industrial and Other Metal Valve are natural private/PE roll-up fields. Fluid Power splits between listed industrials and a private distribution layer. Faucets are the one place a public investor gets a nearly-direct read (Masco, Fortune Brands, and — for commercial specification — Zurn Elkay) [4], but the strongest single residential operator (Kohler) is locked in private hands.

3. Size — the level's rollup figures

The federal statistics for the whole NAICS 33291 group (our ground-truth data for this level) [6]:

How the children add up. The four receipts figures sum to about $36.6 billion, essentially the $36.65 billion group total; the establishment counts sum exactly to 1,136; and payroll and employment reconcile within rounding [2][3][4][5][6]. One number does not simply add: the four industry firm-counts sum to 929, but the group shows 893 firms, because a company that manufactures in more than one child industry is counted once at the group level — a reminder that these lines blur inside real companies [6].

Concentration at the group level is very low. The top four firms hold 20.8% of group shipments, the top eight 29.6%, the top twenty 46.4%, and the top fifty 66.4%; the Herfindahl-Hirschman Index (HHI, a 0–10,000 concentration score where regulators treat under 1,500 as "unconcentrated") is just 192.1 [6]. Both the top-four and top-eight aggregates are lower than the corresponding ratio in every one of the four children — because different leaders dominate each child (one company leads faucets, another leads fluid power, others lead industrial valves), so no single firm looms large over the combined group [2][3][4][5].

Firm size, and why "small" is misleading. The federal small-business thresholds split the group in two: 750 employees for Industrial Valve and Other Metal Valve, 1,000 for Fluid Power and faucets [8]. That produces an oddity worth noting — under those definitions nearly every one of the 88 faucet firms counts as "small," even though four of them ship almost two-thirds of the industry's revenue [4][8].

Undercount caveat (important). These figures measure U.S. factory output, and they understate the economic footprint an investor is really looking at, for reasons that vary by child:

• Imports. A large share of U.S. consumption — especially faucets (332913) and commodity fittings (332919, chiefly from China, Mexico, and India) — is made abroad and never appears in domestic shipments [4][5].
• Diversified parents. The biggest producers are multi-product multinationals (Emerson, Parker, Masco, Mueller); their valve output is often booked inside plants classified under broader codes, and their segment revenues include foreign-made goods and non-U.S. sales — you cannot equate a segment to the NAICS number [9][13][16][20].
• Aftermarket and distribution. The high-margin repair, service, and distribution economy that surrounds valves is booked in trade and service codes, not here.
• Private consumption-basis estimates are not additive. The children carry three of them, on three different bases: one firm put all U.S. valve manufacturing (all four codes, including imported and serviced product) near $39.3 billion in 2024; another put the U.S. industrial valve market alone near $15 billion in 2024, growing 4–5% a year, inside a global market near $90 billion; and the fluid-power trade association counts $23.3 billion of total U.S. fluid-power component shipments in 2024 (hydraulic $17.6B, pneumatic $5.6B), a figure that includes pumps, motors, and cylinders excluded from 332912 [7]. These overlap and were built on different definitions — stacking them would manufacture a number [7].

This is genuine factory manufacturing, not a field dominated by government or by tiny individual operators, so the Census capture of the plants that do exist is reliable — the gap is imports, off-code output, and the service layer, not undercounted small owners.

4. Investable universe — where the value concentrates

The recurring pattern across all four children: no pure-play stock; value reaches public markets through diversified companies, and a large share sits in private, foreign, or PE hands. Where the meaningful exposure lives, by child (tickers for the how-to-invest question only; treat prices, yields, and multiples as items to check at the time of any decision):

332911 Industrial Valve — diversified flow-control and energy names. Emerson Electric (NYSE: EMR) owns the highest-quality valve franchise (Fisher control valves, Crosby and Anderson Greenwood relief valves, Bettis actuators) inside a Final Control segment that booked about $4.38 billion of sales and $1.08 billion of segment earnings in FY2025 [9]. Flowserve (NYSE: FLS) is the closest thing to a flow-control pure-play — its Flow Control Division ran about $1.51 billion at a 29.6% gross and 11.9% operating margin inside a ~$4.7 billion company in 2025 [10]. Crane Company (NYSE: CR) sells roughly $948 million of process valves inside a ~$1.26 billion Process Flow Technologies segment earning a 21.0% operating margin [11]. Mueller Water Products (NYSE: MWA) is the waterworks angle — Water Flow Solutions about $825 million at a 35.9% gross margin inside a ~$1.43 billion company [12]. Curtiss-Wright (NYSE: CW, ~$3.1B) brings nuclear and naval valves; ITT (NYSE: ITT) carries a ~$1.4 billion Industrial Process segment; Baker Hughes (NASDAQ: BKR) holds Masoneilan, Consolidated, and Continental Disc [2]. Large private/foreign owners include Bray International, KKR's CIRCOR, DeZURIK (majority-owned by Granite Equity Partners), and Val-Matic, with IMI, Rotork, Weir, Valmet, and KITZ listed abroad [2].

332912 Fluid Power — motion-and-control industrials. Parker Hannifin (NYSE: PH), the ~$19.9 billion global motion-and-control leader running a 23.0% FY2025 segment operating margin, is the cleanest large-cap read [13]. Gates Industrial (NYSE: GTES) is smaller and more directly hydraulics-levered — its Fluid Power segment runs about $1.3 billion at a 22.4% adjusted EBITDA margin, split $932 million aftermarket to $364 million OEM [14]. Helios Technologies (NASDAQ: HLIO) is the cartridge-valve read — Hydraulics about $540 million at a 32.3% gross and 16.9% operating margin [15]. Emerson (ASCO, AVENTICS pneumatics) and Moog (NYSE: MOG.A, ~$3.6B, aerospace servo valves) add further exposure [3]. Huge private, foundation-owned, and foreign majors — Bosch Rexroth, Danfoss, SMC, Festo, Swagelok (~$2B, private), IMI/Norgren — are not directly investable on U.S. exchanges [3].

332913 Plumbing Trim — three listed reads, not two. This is the one child with nearly-direct public vehicles. Masco (NYSE: MAS) reported Plumbing Products net sales of $4.99 billion at a ~17.9% operating margin in FY2025 (Delta, Brizo, Hansgrohe, Peerless) [16]; Fortune Brands Innovations (NYSE: FBIN) reported Water Innovations at $2.45 billion and ~22.2% (Moen, House of Rohl) [17]. The revised child adds a third: Zurn Elkay Water Solutions (NYSE: ZWS), $1.70 billion company-wide at a 16.4% operating margin, the closest listed read on commercial and institutional specification demand (sensor faucets, flush valves) rather than residential remodeling [18]. Foreign-listed parents ASSA ABLOY (Pfister), LIXIL (American Standard, GROHE), and TOTO add more [4]. The strongest single residential operator, Kohler (~$7 billion, family-controlled), is private, as is commercially focused Sloan Valve [19][4].

332919 Other Metal Valve — plumbing/flow-control diversifieds. Mueller Industries (NYSE: MLI; ~$3.76 billion total, with a ~$2.71 billion Piping Systems segment) and Watts Water Technologies (NYSE: WTS; $2.44 billion at a 49.5% gross and 18.4% operating margin) are the meaningful public reads [20][21]; Mueller Water Products adds municipal waterworks; Aalberts (AMS: AALB) owns the Apollo/Conbraco brass-valve brand [5]. This is the deepest private field — NIBCO (family-owned, and now the owner of Milwaukee Valve and Matco-Norca), Legend Valve, ASC Engineered Solutions (Anvil, Smith-Cooper), Victaulic, Viega, and a bench of regional brass foundries and import-sourcing houses [5].

The distribution layer, shared across three children. Both the Industrial Valve and Other Metal Valve children point to the same listed distributor: Core & Main (NYSE: CNM), which reported $7.65 billion of FY2025 sales including $5.14 billion of pipes, valves, and fittings — about 67% of the total — at a 26.9% gross margin [22]. It is exposure to infrastructure distribution and consolidation, with substantial pass-through metal value and products spanning many NAICS codes, not to valve manufacturing economics [22].

The cross-cutting read for stock pickers: because valves are always a segment, judge these names on segment operating margin, aftermarket mix, bookings/backlog, and end-market diversification — not on a "valve multiple," which does not exist. For private capital, the group is unusually rich: fragmented manufacturing tails plus asset-light distribution and repair networks in three of the four children.

5. How the money works

Across the group, owners make money on a spread between metal cost and selling price, multiplied by volume, with profitability set by a handful of shared levers — but the balance of those levers differs by child.

• Input costs. Cost of goods is dominated by brass (copper + zinc), bronze, ductile iron, steel, and nickel alloys, plus castings and forgings. Margins swing with metal prices and with the ability to pass them through on a lag. Copper matters most to faucets and brass fittings (332913, 332919); nickel alloys and long-lead castings matter most to severe-service industrial valves (332911). Both Crane and Mueller Water attributed 2025 cost pressure to materials, labor, and tariffs, largely offset by pricing and productivity; Mueller Industries notes that FIFO accounting can distort margins during large metal-price moves; Gates warns it holds no long-term raw-material contracts, so pass-through timing cuts both ways [11][12][14][20].
• Spec-in and certification — the shared moat. In every child, the durable advantage is being designed in and certified. An industrial valve on an operator's approved-vendor list, a hydraulic cartridge specified into a machine platform, a faucet certified lead-free, or a fitting approved to drinking-water code all create switching costs and pull years of reorders and replacement. Certifications are costly and slow to earn — a real barrier against low-price imports [2][3][4][5].
• Aftermarket / replacement — the shared cushion, but on different clocks. Once installed, valves wear, leak, and must be repaired or replaced on the operator's schedule, not the market's. Industry estimates put the replacement/maintenance-repair-and-overhaul (MRO) cycle at roughly 50–55% of industrial-valve demand [23]; fluid-power channels run roughly two-thirds original-equipment (OEM) and one-third aftermarket [24] — though that rule of thumb does not describe individual franchises, since Gates' Fluid Power segment reported aftermarket sales of $932 million against $364 million of OEM, and Helios sold 49% through channel partners versus 51% direct to OEMs [14][3]; and faucets are majority repair-and-remodel (R&R), which Masco identifies as its primary end market and the children put at roughly two-thirds to three-quarters of demand [16][4]. In all four, the aftermarket cushions the capital-spending cycle without eliminating it.
• Capacity utilization. These are fixed-cost foundry and machining plants; profitability is highly sensitive to how full they run. This bites hardest in the two most cyclical children (Fluid Power and Other Metal Valve) [3][5].
• The margin spread across the group is wide — and not cleanly comparable. The reported figures run from Flowserve's Flow Control Division at an 11.9% operating margin and Zurn Elkay at 16.4%, through Helios Hydraulics at 16.9%, Masco Plumbing at ~17.9%, Watts at 18.4%, Crane's process-flow segment at 21.0%, and Fortune Brands Water at ~22.2%, to Mueller Industries' Piping Systems at 28.5% (flattered by $41 million of insurance and $15 million of asset-disposal gains) [10][18][15][16][21][11][17][20]. Differences in product mix, geographic scope, segment overhead, and acquired-intangible amortization prevent a clean read across companies, let alone across NAICS children.
• Pricing power shows up differently by child. Producer prices have risen in both metal-heavy children the federal data lets us track, but at very different rates: the faucet index rose 10.3% from December 2024 to December 2025 and reached 417.6 by June 2026, while the Other Metal Valve index rose 5.7% in the twelve months to June 2026 [25]. The measurement windows differ, so this is directional, not a clean comparison — but it is consistent with the branded consumer child holding more pricing power than the commodity-fitting child.
• What differs. Faucets add a consumer-brand lever the others lack — premium finishes and smart/connected features lift average selling price and mix [16][17]. Fluid Power adds long-cycle aerospace backlog as a smoothing factor [13]. Industrial Valve adds severe-service pricing power (nuclear-qualified, cryogenic, high-pressure product) that commodity makers cannot touch [2].

6. Demand drivers

Demand is derived in every child — it tracks the end market, not a consumer whim — but the end markets barely overlap:

• Energy and process infrastructure (mainly 332911): the revised child corrects a common misread — this is not a pure oil-services industry. A trade-association forecast put chemicals at 17.9% of shipments, water and wastewater at 16.3%, petroleum production at 13.1%, power generation at 11.7%, refining at 11.3%, and oil-and-gas transmission at 6.4% [26], and Flowserve's 2025 bookings split energy 32%, chemical 27%, general industries 25%, and power 16% [10]. On top of that base sit U.S. LNG export buildout (export capacity around 15 billion cubic feet per day in 2025), gas-fired power for data-center load, nuclear life-extension and small modular reactors, and chemical and semiconductor reshoring [23][2].
• Heavy and mobile machinery (mainly 332912): construction and mobile equipment, agriculture, factory automation, and aerospace/defense — the classic capital-goods cycle. For the broader fluid-power market, construction machinery, agricultural machinery, material handling, heavy trucks, and automotive together account for 57% of hydraulic sales, while material handling, semiconductor, packaging, food, and metalworking machinery account for 27% of pneumatic sales [7].
• Housing and consumer (mainly 332913): repair-and-remodel spending, existing-home sales, new residential construction, and the interest-rate/affordability path that governs all three; design cycles (touchless, leak-detection, connected fixtures) pull forward replacement of still-working product [4].
• Buildings, water, and utilities (332919 and the waterworks slice of 332911): residential and commercial construction, HVACR (heating, ventilation, air conditioning, and refrigeration), fire protection, and irrigation — which is a larger end market than it looks, with irrigation accounting for 47% of U.S. freshwater withdrawals and pressurized irrigation in the 17 western states expanding from 14.7 million acres in 1984 to 29 million in 2023 [5].
• Shared structural threads. Federal water funding supports the two water-facing children: the EPA puts the 20-year drinking-water infrastructure need at $625 billion (of which $421 billion is distribution and transmission), and the 2021 Infrastructure Investment and Jobs Act (IIJA) directs more than $50 billion through the EPA — including $11.7 billion each for the drinking-water and clean-water revolving funds and $15 billion specifically for lead-service-line replacement [27]. Authorization is not revenue: projects convert over several years [2]. The replacement cycle itself remains the single most reliable demand source across the whole group.

7. Regulation

None of these industries is licensed by a single agency; all are governed by dense webs of product standards that buyers treat as mandatory, plus water-safety law and trade policy. The standards differ by child but the pattern — certification as both a cost and a competitive moat — is common:

• Industrial, pressure, and municipal standards (332911): the American Petroleum Institute (API 6D, 600/602, 598) and the American Society of Mechanical Engineers (ASME B16.34, Boiler and Pressure Vessel Code) set design, testing, and pressure ratings; municipal product is specified to American Water Works Association standards such as C504 (rubber-seated butterfly valves) and C509 (resilient-seated gate valves); nuclear valves require ASME Section III and Nuclear Regulatory Commission oversight — a high, incumbent-protecting barrier [28]. Fugitive-emissions ("low-E") standards (API 622/624/641) tested against U.S. Environmental Protection Agency (EPA) Method 21, with a typical 100 parts-per-million allowable limit, turn tightening methane rules into a demand driver for certified valves [28][2].
• Fluid-power engineering specs (332912): hydraulic hose and fittings are built to SAE J517 (the Society of Automotive Engineers' dominant North American spec, defining series 100R1–100R19) and the performance-based ISO 18752 (nine pressure classes to 8,000 psi); compliance is a commercial requirement even though it is not government-mandated [28][3].
• Water and lead safety (332913, 332919): drinking-water valves, faucets, and fittings must meet the Reduction of Lead in Drinking Water Act — a weighted average of ≤0.25% lead on wetted surfaces and ≤0.2% for solder and flux — demonstrated through NSF/ANSI/CAN 61 and 372 certification, effectively mandatory since September 2023 [29][4][5]. Faucets also meet federal flow caps (2.2 gallons per minute for kitchen faucets, 1.5 gpm for lavatory faucets, 2.5 gpm for showerheads) and the EPA's voluntary WaterSense label (1.5 gpm faucets, 2.0 gpm showerheads) [29].
• Trade policy — a group-wide shock that has now moved three times. Section 232 national-security tariffs on steel and aluminum were doubled to 50% in June 2025 [30]; in August 2025 the regime was expanded to hundreds of product codes explicitly including pipe fittings (Harmonized Tariff Schedule heading 7307), so that stacked with Section 301 China duties some Chinese steel fittings face rates near 75% [30]; a separate 50% Section 232 tariff on semi-finished copper and copper-intensive products took effect in August 2025, with reported plumbing-goods price increases of 15–35% [30]; and a June 2026 proclamation set a 25% additional rate for defined lists through the end of 2027, subject to specified exceptions [30]. The revised Industrial Valve child is the one that carries this last change, and its caution generalizes to the whole group: whether a particular valve, casting, or fitting falls inside an annex requires product-level customs analysis, and the 2025-era 50% figures cited in the plumbing-side children may no longer describe every product line [2]. Throughout, tariffs help domestic producers on the sales side but raise their own metal input costs. Build America, Buy America domestic-content rules on IIJA-funded water projects further steer federal dollars to U.S. makers [27].

8. Consolidation

The group is fragmented at the aggregate level (top-four share 20.8%, HHI 192.1) and consolidation is active in all four children — but the acquirers differ [6]:

*HHI suppressed in federal data for these two children; we do not state a value [3][4].

Representative deals across the group [31]: KKR took CIRCOR private in 2023 — the Industrial Valve child puts the headline value at about $1.7 billion and the Other Metal Valve child at about $1.6 billion, a discrepancy we leave standing rather than split [2][5]; Flowserve bought severe-service specialist MOGAS (~$305 million, 2024), then agreed to merge with Chart Industries, terminated after Baker Hughes outbid it — collecting a $266 million break fee — and instead bought Trillium Flow Technologies' valves division for $490 million (closed 2026); Baker Hughes also bought Continental Disc ($540 million, 2025); Crane acquired Baum Lined Piping ($93.5 million, 2023); and Valmet completed its purchase of ValvTechnologies on July 1, 2026 [2]. In fluid power, Danfoss bought Eaton's hydraulics business for $3.3 billion (2021, ~$1.8 billion of 2020 sales and ~10,000 employees) and Bosch Rexroth bought HydraForce (2023), while sponsors such as JMH Capital build distributor platforms [3]. In faucets, ASSA ABLOY acquired the Pfister-owning Hardware & Home Improvement division for $4.3 billion (June 2023) [4]. In Other Metal Valve, NIBCO rolled up Milwaukee Valve and Matco-Norca while Aalberts holds Apollo/Conbraco [5].

Two structural notes. First, the common thread: strategics buy their way into certified, specialty, or branded niches, while PE assembles platforms from the fragmented middle and — in three of the four children — from the asset-light distribution and repair layer, where aftermarket economics are the prize. Second, and a useful corrective to the deal flow: all this activity has barely moved the needle on fragmentation. Other Metal Valve's 2002 Economic Census showed 238 companies, a CR4 of 19.8%, and an HHI of 217.4 — versus 175 firms, 21.1%, and 230.5 twenty years later [32]. Roll-ups have consolidated ownership faster than they have consolidated share.

9. Risks

The children share a risk core and diverge on emphasis:

• Cyclicality (shared, uneven). Fluid Power is the most cyclical — earnings swing hard with construction, agriculture, and factory-machinery cycles, as the 2024 shipment declines showed [3]. Industrial Valve rides the energy and process capital-spending cycle; faucets and Other Metal Valve ride housing and interest rates. The aftermarket cushions all four but eliminates the cycle in none.
• Input-cost and tariff shock (shared). Volatile brass, copper, nickel, steel, and casting prices hit cost of goods directly; margin depends on pass-through timing, and tariffs cut both ways by inflating inputs [30].
• Trade-policy volatility (shared, and now a distinct risk from tariff level). The Section 232 schedule was raised in 2025, expanded in August 2025, and reset again by a June 2026 proclamation — three material changes in about twelve months. Sudden changes are hard to plan around, and coverage is determined product by product [30][2].
• Import competition (shared). Low-cost imports pressure the commodity tail hardest in faucets and Other Metal Valve; domestic makers defend on engineered product, certifications, service, and Buy-America rules [4][5].
• Channel and customer concentration (shared, newly emphasized by the children). Downstream buyers hold real leverage. In faucets, Home Depot and Lowe's each represented 11% of Fortune Brands' total 2025 sales, its top ten customers 52%, and the two home centers together 21% of Water-segment sales [17]. In building products, Watts sold 66% of 2025 revenue through wholesalers [21], and distribution itself has consolidated into a few names (Ferguson, Core & Main) [5][22]. Retailers can also promote private labels and make pricing transparent online [4].
• Substitution (per child, and understated in the prior version of this page). In Other Metal Valve, plastics — PVC, CPVC, PEX — are the principal plumbing substitute for metal fittings, and Mueller Industries identifies their share as increasing; metal keeps advantages on temperature, pressure, fire resistance, and spec familiarity [20][5]. In Fluid Power, electrification of actuation is a slow, real threat to parts of the hydraulic-valve franchise — though the trade association's own assessment is that hydraulics still leads on power density, shock tolerance, and robustness, and that electrified machines often retain hydraulic work functions while demanding more sophisticated electro-hydraulic components, which could raise engineering content rather than eliminate it [34][3].
• Labor and foundry capacity (shared). Skilled machinists, welders, and foundry workers are scarce, and capacity is not quickly added. As a broad occupational proxy, the Bureau of Labor Statistics projects about 34,200 machinist and tool-and-die openings annually from 2024–2034 — almost entirely replacement of workers leaving the occupation — despite a projected 2% employment decline, with median May 2024 machinist pay of $56,150 [33].
• Secular end-market risk (per child). Long-run hydrocarbon-capex decline is a risk to Industrial Valve, partly (perhaps more than) offset by hydrogen, carbon-capture, nuclear, and water demand (judgment, not certainty) [2].
• Product liability (shared). A failed valve or fitting can mean flooding, contamination, or — in high-pressure or nuclear service — catastrophe. High-pressure fluid-power failures carry their own injection-injury and hose-whip exposure, and the Fluid Power child reports a 2022 recordable injury rate of 2.1 cases per 100 full-time workers [3]. Certification and reputation are existential.
• Not a stand-alone equity (shared). Public investors cannot isolate any of these exposures; you buy a diversified company and get valves as one ingredient, diluting the thesis.

10. How to invest and the outlook

Match the vehicle to the child you actually want:

• Energy/infrastructure valve exposure (332911): Flowserve (FLS) for the closest flow-control pure-play; Emerson (EMR) for the highest-quality franchise; Curtiss-Wright (CW) for nuclear/naval and less oil-cyclicality; Crane (CR), ITT (ITT), Baker Hughes (BKR); Mueller Water (MWA) for the waterworks angle; IMI, Rotork, Weir, Valmet, and KITZ abroad [2].
• Machinery/capital-goods valve exposure (332912): Parker Hannifin (PH) for the cleanest large-cap read; Gates (GTES) and Helios (HLIO) for higher-beta, more hydraulics-levered bets; Moog (MOG.A) for aerospace [3].
• Consumer/housing exposure (332913): Masco (MAS) and Fortune Brands Innovations (FBIN) for residential faucets and trim, and Zurn Elkay (ZWS) for the commercial/institutional specification layer — all strong-margin, cash-generative building-products names [16][17][18].
• Building/water exposure (332919): Mueller Industries (MLI) and Watts Water (WTS) for the most direct reads; Aalberts (AALB) for Apollo brass valves [5].
• Distribution, across children: Core & Main (CNM) for pipe, valve, and fitting volumes — infrastructure distribution rather than manufacturing economics [22].

Private-market routes are where the group is most directly investable and, in three of four children, richer than the public options: buying or backing regional industrial-valve, brass-foundry, or fitting manufacturers positioned for Buy-America demand; and — most repeatable of all — the distribution and repair/service networks in industrial and fluid-power valves, which throw off recurring, high-margin, capital-light cash and are the standard PE roll-up target. The children converge on what makes a defensible target: an installed base, approved-vendor positions and certification libraries, proprietary or hard-to-machine designs, broad SKU availability, distributor relationships, and meaningful aftermarket revenue — with diligence separating true organic volume from metal-price pass-through [2][5]. Faucets are the exception: the marquee private operators (Kohler, Sloan) are closed to most investors, and public MAS/FBIN/ZWS are the better route [4].

Near-term outlook (forward-looking, not guaranteed). The setup is constructive-to-mixed and, importantly, diversified across cycles. Industrial Valve enjoys LNG, gas-power, nuclear, chemical-reshoring, and water tailwinds; Fluid Power has passed a soft 2024 and an early-2025 trough, with pneumatic shipment trends improving and industry forecasters flagging a possible recovery in 2026 [35]; faucets are modest and rate-dependent with a replacement cushion; Other Metal Valve is steady and infrastructure-levered as IIJA water and lead-line money converts [2][3][4][5]. Tariffs and Buy-America rules tilt toward domestic producers across the whole group, while raising their input costs — and the tariff schedule itself is now a moving target [30]. The aftermarket and replacement cycle provide a floor under demand in every child through any capital-spending wobble. The swing factors to watch are the oil-and-gas and construction capital-spending cycles, metal costs and the tariff path, foundry/casting capacity, housing rates, and — as slow secular questions — how much electrification displaces hydraulic valves and how much plastic displaces metal fittings. These are judgments about direction; the ground-truth federal figures in section 3 are the reported facts.

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Sources

1. U.S. Census Bureau, 2022 NAICS — Industry Group 33291 Metal Valve Manufacturing and constituent industries 332911/332912/332913/332919 (definitions and cross-references), 2022. https://www.census.gov/naics/
2. Histometrics child primer, Industrial Valve Manufacturing (NAICS 332911) — scope, ownership, end markets, standards, M&A, trade-policy sequence, and 2022 Economic Census / 2023 CBP figures (receipts $14.28B; 395 firms; 472 establishments; 34,046 employees; payroll $2.66B; CR4 22.6%, CR8 36.1%; HHI 244.8), 2026.
3. Histometrics child primer, Fluid Power Valve and Hose Fitting Manufacturing (NAICS 332912) — scope, ownership, cycle, standards, electrification, and 2022 Economic Census / 2023 CBP figures (~$10.9B shipments; 271 firms; 331 establishments; ~31,100 employees; payroll ~$2.35B; ~$75,000 average pay; CR4 38.4%, CR8 50%; HHI suppressed), 2026.
4. Histometrics child primer, Plumbing Fixture Fitting and Trim Manufacturing (NAICS 332913) — scope, branded oligopoly, commercial-spec layer, standards, and 2022 Economic Census / 2023 CBP figures ($6.60B receipts; 88 firms; 121 establishments; 9,069 employees; payroll $577.5M; ~$63,700 average pay; CR4 63.9%, CR8 83.1%; HHI suppressed), 2026.
5. Histometrics child primer, Other Metal Valve and Pipe Fitting Manufacturing (NAICS 332919) — scope, fragmentation, water/lead regulation, tariffs, plastic substitution, and 2022 Economic Census / 2023 CBP figures ($4.86B receipts; 175 firms; 212 establishments; 13,428 employees; payroll $933.7M; ~$70,000 average pay; CR4 21.1%, CR8 32.4%; HHI 230.5), 2026.
6. Histometrics ground-truth federal statistics, NAICS 33291 Metal Valve Manufacturing — 2022 Economic Census (receipts $36,654,208K; 893 firms; CR4 20.8%, CR8 29.6%, CR20 46.4%, CR50 66.4%; HHI 192.1) and County Business Patterns 2023 (1,136 establishments; 87,679 employees; annual payroll $6,517,529K). U.S. Census Bureau.
7. Private and association market-size estimates on differing bases (not additive): IBISWorld, Valve Manufacturing in the US ($39.3B, 2024; import penetration), 2024/2026, https://www.ibisworld.com/united-states/industry/valve-manufacturing/655/; Global Market Insights, North America Industrial Valve Market (U.S. ≈ $15B in 2024, ~4.4% CAGR), 2025, https://www.gminsights.com/industry-analysis/north-america-industrial-valve-market; MarketsandMarkets, Industrial Valves Market — Global Forecast to 2032 (global ≈ $89–90B), 2025, https://www.marketsandmarkets.com/Market-Reports/industrial-valve-market-256097136.html; National Fluid Power Association, Fluid Power Industry Fact Sheet (2024 component shipments $23.3B — hydraulic $17.6B, pneumatic $5.6B; ~775 companies; hydraulic and pneumatic end-market shares), Oct. 2025, https://www.nfpa.com/hubfs/UPDATED%20Oct%202025%20Fluid%20Power%20Industry%20Fact%20Sheet.pdf?hsLang=en
8. U.S. Small Business Administration, Table of Small Business Size Standards (332911/332919 = 750 employees; 332912/332913 = 1,000 employees), 2023. https://www.sba.gov/document/support-table-size-standards
9. Emerson Electric Co., Form 10-K FY2025 (Final Control segment sales $4,380M, segment earnings $1,081M; Fisher, Crosby, Anderson Greenwood, Bettis, Keystone), 2025. https://www.sec.gov/Archives/edgar/data/32604/000003260425000087/emr-20250930.htm
10. Flowserve Corporation, Form 10-K FY2025 (Flow Control Division sales $1,505M, 29.6% gross margin, 11.9% operating margin; 2025 bookings mix energy 32% / chemical 27% / general industries 25% / power 16%; principal inputs), 2026. https://www.sec.gov/Archives/edgar/data/30625/000003062526000003/fls-20251231.htm
11. Crane Company, Form 10-K FY2025 (Process Flow Technologies process valves $947.6M; segment $1,256M at 21.0% operating margin; material, labor, and tariff cost pressure), 2026. https://www.sec.gov/Archives/edgar/data/1944013/000194401326000095/cr-20251231.htm
12. Mueller Water Products, Form 10-K FY2025 (Water Flow Solutions $824.9M at 35.9% gross margin; total $1,430M; inflation/tariff offsets), 2025. https://www.sec.gov/Archives/edgar/data/1350593/000135059325000066/mwa-20250930.htm
13. Parker-Hannifin Corporation, Fiscal 2025 Fourth Quarter and Full Year Results (net sales $19.9B; segment operating margin 23.0%), 2025. https://investors.parker.com/news-events/press-releases/detail/487/parker-reports-fiscal-2025-fourth-quarter-and-full-year
14. Gates Industrial Corporation, Form 10-K (Fluid Power segment sales $1.296B; adjusted EBITDA margin 22.4%; aftermarket $932M vs OEM $364M; raw-material pricing), 2026. https://www.sec.gov/Archives/edgar/data/1718512/000162828026007719/gtes-20251231.htm
15. Helios Technologies, Fourth Quarter and Full Year 2025 Financial Results (Hydraulics segment $540.8M; gross margin 32.3%; operating margin 16.9%), 2026. https://www.sec.gov/Archives/edgar/data/1024795/000119312526085812/hlio-ex99_1.htm
16. Masco Corporation, Form 10-K FY2025 (Plumbing Products net sales $4.992B, operating margin 17.9%; Delta, Brizo, Hansgrohe; repair-and-remodel as primary end market; raw materials and pass-through), 2026. https://www.sec.gov/Archives/edgar/data/62996/000006299626000005/mas-20251231.htm
17. Fortune Brands Innovations, Inc., Form 10-K FY2025 (Water Innovations net sales $2.4476B, operating margin 22.2%; Moen, House of Rohl; customer concentration — Home Depot and Lowe's 11% each of total sales, top ten 52%, 21% of Water-segment sales), 2026. https://www.sec.gov/Archives/edgar/data/1519751/000119312526063960/fbin-20251227.htm
18. Zurn Elkay Water Solutions Corporation, Form 10-K FY2025 (net sales $1.6959B, operating margin 16.4%; commercial/institutional sensor faucets and flush valves), 2026. https://www.sec.gov/Archives/edgar/data/1439288/000162828026006372/zws-20251231.htm
19. Forbes / IBISWorld, Kohler Co. company profile (privately held, ~$7B revenue), 2025. https://www.forbes.com/companies/kohler/
20. Mueller Industries, Inc., Form 10-K FY2025 (Piping Systems $2.71B and $772M operating income, including $41M insurance and $15M asset-disposal gains; metal-cost pass-through and FIFO effects; plastics as principal substitute), 2026. https://www.sec.gov/Archives/edgar/data/89439/000008943926000008/mli-20251227.htm
21. Watts Water Technologies, Inc., Form 10-K FY2025 (net sales $2.44B; 49.5% gross margin, 18.4% operating margin; 66% wholesale / 10% OEM / 21% specialty channel mix; connected leak and freeze protection), 2026. https://www.sec.gov/Archives/edgar/data/795403/000110465926018541/wts-20251231x10k.htm
22. Core & Main, Inc., Form 10-K for fiscal year ended Feb. 1, 2026 (net sales $7.65B; pipes, valves & fittings $5.14B ≈ 67% of sales; gross margin 26.9%), 2026. https://www.sec.gov/Archives/edgar/data/1856525/000185652526000031/cnm-20260201.htm
23. IndexBox, Oil & Gas Valves and LNG Demand (replacement/MRO ≈ 50–55% of industrial-valve demand; U.S. LNG export capacity ≈ 15 Bcf/d in 2025), 2025. https://www.indexbox.io/blog/oil-and-gas-valves-market-demand-to-accelerate-by-2035-supported-by-global-energy-infrastructure-modernization/
24. Mordor Intelligence / IndexBox, Fluid Power Systems Market (OEM ≈ 65% vs aftermarket channel mix; aftermarket as cyclical buffer), 2025. https://www.mordorintelligence.com/industry-reports/global-fluid-power-equipment-market
25. U.S. Bureau of Labor Statistics / FRED, Producer Price Indexes: NAICS 332913 (371.6 Dec. 2024 → 410.0 Dec. 2025, +10.3%; 417.6 June 2026), https://fred.stlouisfed.org/data/PCU332913332913; NAICS 332919 (403.7 June 2025 → 426.8 June 2026, +5.7%; Dec. 1982 = 100), https://fred.stlouisfed.org/data/PCU332919332919, 2026.
26. Valve Manufacturers Association, 2020 Market Forecast (end-market breakdown: chemicals 17.9%, water/wastewater 16.3%, petroleum production 13.1%, power generation 11.7%, refining 11.3%, oil/gas transmission 6.4%), 2020. https://cdn.ymaws.com/www.vma.org/resource/resmgr/docs/2020_Market_Forecast_and_pie.pdf
27. U.S. Environmental Protection Agency, water infrastructure and domestic-preference materials: Water Infrastructure Investments (IIJA provides more than $50B through EPA), https://www.epa.gov/infrastructure/water-infrastructure-investments; Fact Sheet: EPA Bipartisan Infrastructure Law ($11.7B DWSRF, $11.7B CWSRF, $15B lead-service-line replacement), https://www.epa.gov/infrastructure/fact-sheet-epa-bipartisan-infrastructure-law; Seventh Drinking Water Infrastructure Needs Survey and Assessment ($625B 20-year need; $421B distribution/transmission), Sept. 2023, https://www.epa.gov/system/files/documents/2023-09/Seventh%20DWINSA_September2023_Final.pdf; Build America, Buy America (BABA) Overview, https://www.epa.gov/baba/build-america-buy-america-baba-overview
28. Core product standards across the group: ASME, B16.34 Valves — Flanged, Threaded, and Welding End, https://www.asme.org/codes-standards/find-codes-standards/b16-34-valves-flanged-threaded-welding-end; American Water Works Association, Standards List (C504, C509), https://www.awwa.org/Publications/Standards/Standards-List; SAE International, SAE J517 Hydraulic Hose (and ISO 18752), https://www.sae.org/standards/j517_202007-hydraulic-hose; Valve Magazine, Fugitive Emissions Standards for Valves (API 622/624/641; EPA Method 21; 100 ppm), 2024, https://valvemagazine.com/articles/fugitive-emissions-standards-for-valves/
29. Water and lead-safety requirements: U.S. Environmental Protection Agency, WaterSense faucet specification and DOE flow-rate standards (2.2 gpm kitchen / 1.5 gpm lavatory at 60 psi), https://www.epa.gov/system/files/documents/2023-06/ws-commercial-watersense-at-work_Section_3.3_Faucets.pdf; EPA WaterSense, Showerheads (2.0 gpm), https://www.epa.gov/watersense/showerheads; EPA, Use of Lead Free Pipes, Fittings, Fixtures, Solder, and Flux for Drinking Water (≤0.25% weighted-average lead; 0.2% solder/flux), https://www.epa.gov/sdwa/use-lead-free-pipes-fittings-fixtures-solder-and-flux-drinking-water; NSF, Safe Drinking Water Act Requirements (NSF/ANSI/CAN 61 and 372), https://www.nsf.org/knowledge-library/safe-drinking-water-act-requirements
30. Trade policy: The White House, Adjusting Imports of Aluminum and Steel into the United States (Section 232 raised to 50%), June 2025, https://www.whitehouse.gov/presidential-actions/2025/06/adjusting-imports-of-aluminum-and-steel-into-the-united-states/; The White House, Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper (25% additional rate for defined lists through end of 2027), June 2026, https://www.whitehouse.gov/presidential-actions/2026/06/further-adjusting-the-tariff-regimes-for-imports-of-aluminum-steel-and-copper-into-the-united-states/; MSI, Iron Pipe Fittings Now Tariffed Under Section 232 Expansion (HTS 7307; Section 232 + Section 301 stacking near 75%), 2025, https://www.msi-products.com/pipe-fittings-now-tariffed-under-section-232-expansion-what-distributors-need-to-know/; White & Case, United States Finalizes Section 301 Tariff Increases on Imports from China (with 50% Section 232 copper tariff effective Aug. 2025 and 15–35% plumbing-goods price increases), 2024–2025, https://www.whitecase.com/insight-alert/united-states-finalizes-section-301-tariff-increases-imports-china
31. Sector M&A: Valve Magazine, CIRCOR Enters Acquisition Deal with KKR, https://valvemagazine.com/news/circor-international-enters-acquisition-deal-with-kkr/ and Kirkland & Ellis, KKR to acquire CIRCOR International, https://www.kirkland.com/news/press-release/2023/06/kirkland-represents-kkr-in-acquisition-of-circor-international; Flowserve, Completes Acquisition of MOGAS Industries, https://ir.flowserve.com/news-events/news-details/2024/Flowserve-Completes-Acquisition-of-MOGAS-Industries/default.aspx; Flowserve, Terminates Merger with Chart Industries ($266M), https://ir.flowserve.com/news-events/news-details/2025/Flowserve-Corporation-Terminates-Merger-with-Chart-Industries/default.aspx; World Oil, Flowserve Completes $490 Million Acquisition of Trillium Valves Business, https://worldoil.com/news/2026/7/1/flowserve-completes-490-million-acquisition-of-trillium-valves-business/; Baker Hughes, To Acquire Continental Disc Corporation ($540M), https://investors.bakerhughes.com/news/press-releases/news-details/2025/Baker-Hughes-to-Acquire-Continental-Disc-Corporation-a-Differentiated-Leader-in-Pressure-Management-Solutions-06-16-2025/default.aspx; Orrick, Crane Company Acquires Baum Lined Piping ($93.5M), https://www.orrick.com/en/News/2023/10/Crane-Company-Acquires-Baum-Lined-Piping-GmbH; ValvTechnologies/Valmet, Acquisition completed July 1, 2026, https://www.valv.com/about/; Danfoss, Eaton Hydraulics Acquisition Finalized ($3.3B), https://www.danfoss.com/en/about-danfoss/news/cf/eaton-hydraulics-acquisition-finalized/; JMH Capital, JMH Establishes Fluid Power Platform, https://www.jmhcapital.com/blog/jmh-establishes-fluid-power-platform; Security Systems News, ASSA ABLOY to acquire HHI division of Spectrum Brands ($4.3B, closed June 2023), https://www.securitysystemsnews.com/article/assa-abloy-to-acquire-hhi-division-of-spectrum-brands-includes-kwikset; Plumbing & Mechanical, Behind the NIBCO–Matco-Norca acquisition, https://www.pmmag.com/articles/104921-pm-profile-behind-the-nibco-matco-norca-acquisition; Supply House Times, Apollo Valves (Conbraco) sold to Aalberts, https://www.supplyht.com/articles/94816-apollo-valves-sold-to-aalberts
32. U.S. Census Bureau, 2002 Economic Census — Manufacturing Subject Series: Concentration Ratios (NAICS 332919: 238 companies; CR4 19.8%, CR8 34.5%; HHI 217.4), 2002. https://www2.census.gov/library/publications/economic-census/2002/manufacturing-reports/subject-series/ec0231sr1.pdf
33. U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Machinists and Tool and Die Makers (34,200 annual openings 2024–2034; 2% employment decline; $56,150 median pay, May 2024). https://www.bls.gov/ooh/production/machinists-and-tool-and-die-makers.htm
34. National Fluid Power Association, Electrification in Fluid Power Task Force Report (electric vs. hydraulic actuation tradeoffs by application), 2023. https://www.nfpa.com/hubfs/Technology%20Reports/FINALNFPAElectrificationinFluidPowerTaskForceReportFINAL.pdf?hsLang=en
35. Power & Motion / National Fluid Power Association, Fluid-power shipments and the 2026 recovery outlook, 2024–2025. https://www.powermotiontech.com/hydraulics/blog/55308438/potential-recovery-ahead-for-fluid-power-industry