Plastics Plumbing Fixture Manufacturing (U.S.) — NAICS 326191

An investor's primer for public-market and private investors

1. Overview

This is the industry that molds the plastic and fiberglass parts of an American bathroom: the bathtubs, shower stalls and shower pans, tub-and-shower combos, whirlpool and walk-in tubs, cultured-marble vanity tops, plastic toilet seats, and the portable toilets you see on job sites and at events [1]. It sits under NAICS (North American Industry Classification System) code 326191 [1]. It is a real, factory-based manufacturing business — roughly 287 plants and 18,000 workers making about $6 billion of product a year in the United States [2][3].

Why an investor cares: it is a leveraged bet on two of the largest spending flows in the U.S. economy — new home construction and home remodeling — with a durable, aging-population tailwind toward accessible showers and walk-in tubs [8][9]. It is also a classic cyclical manufacturer whose profits swing with housing activity and with the spread between selling prices and petrochemical resin costs.

The catch for stock-market investors is that there is no U.S.-listed pure play. The heart of the industry — the big bathware brands — is owned by private-equity firms and family companies. The public companies with exposure (Masco, Fortune Brands Innovations, and the RV/housing component suppliers Lippert and Patrick) touch it only as one slice of much broader portfolios [4][5][6]. So the practical "ways in" are: buy diversified public building-products names for indirect exposure, or — for private investors — buy or back a regional fabricator or a bath-remodel installer, where most of the money actually is.

2. What it is and how it's structured

Scope. NAICS 326191 covers establishments primarily making plumbing and bathroom fixtures out of plastic or fiberglass [1]. In practice that means:

• Bath and shower units — acrylic and fiberglass-reinforced-plastic (FRP) bathtubs, one-piece and sectional shower stalls, shower bases/pans, wall surrounds, and tub-shower combinations. This is the largest product line.
• Premium and accessibility tubs — whirlpool/jetted tubs, soaking tubs, and walk-in tubs.
• Toilet seats made of plastic.
• Portable and chemical toilets and portable sinks.
• Cultured-marble and solid-surface fixtures, plastic laundry/utility tubs, plastic urinals and flush tanks, and plastic drinking fountains (non-refrigerated) [1].

What it excludes (this matters — "bathroom fixtures" is spread across several codes):

• Vitreous-china and ceramic fixtures — the ceramic toilet bowl, tank, and pedestal sink — are NAICS 327110 (Pottery, Ceramics, and Plumbing Fixture Manufacturing), not here. Most toilets are china, so most of the toilet market sits outside this code.
• Metal plumbing fittings and trim — faucets, showerheads, valves, and spouts — are NAICS 332913 (Plumbing Fixture Fitting and Trim Manufacturing). This is where Moen, Delta, and Grohe faucets belong.
• Enameled iron and metal sanitary ware (cast-iron tubs, enameled steel sinks) — NAICS 332998.
• Plastic pipe and pipe fittings — NAICS 326121/326122.

So 326191 is specifically the molded-plastic-and-fiberglass corner of the bathroom, dominated by big bulky items (tubs and showers) rather than by the small metal trim.

Manufacturing methods. Acrylic tubs and shower bases are generally thermoformed over molds, reinforced, trimmed and drilled, and sometimes assembled with frames, walls, pumps, jets or controls. Fiberglass-reinforced units are commonly open-molded: a mold receives release agent and a surface gel coat, followed by polyester resin, filler and chopped glass fiber; workers compact the laminate, allow it to cure, demold it and complete trimming and finishing. EPA's plant study identifies spray lay-up as the preferred process for many fiberglass shower stalls and tubs and describes gel-coating and successive resin-and-glass applications as important sources of styrene emissions [20]. Portable toilets use a different thermoplastic workflow — receiving polyethylene pellets, blending with pigments and UV additives, extruding sheet for thermoforming, injection-molding smaller parts, and completing final assembly and testing [13].

Ownership mix. The industry is a barbell. At one end sit a handful of large, consolidated bathware manufacturers — most owned by private-equity firms (American Bath Group, Jacuzzi) or by a private family company (Kohler) [4][7][10][11]. At the other end sit dozens of small-to-mid regional fabricators making cultured-marble tops and FRP shower units for their local markets, because these products are cheap relative to their bulk and expensive to ship. Two adjacent niches — plastic toilet seats and portable toilets — are their own concentrated sub-industries led by private companies (Bemis; PolyJohn/Satellite) [12][13][21].

3. How big it is

Our federal figures (U.S. Census Bureau) give the ground truth for U.S.-based production:

A few reads. This is a mid-sized manufacturing industry — average payroll of roughly $54,000 per worker points to blue-collar molding and hand-layup labor [3]. It is moderately consolidated: the top four firms hold about 37% of revenue and the top 50 hold about 90%, but the HHI of 517.7 is low enough to count as "unconcentrated" under federal merger guidelines (below the 1,500 threshold) [2]. In plain terms: there is a clear leader and a handful of large players, but also a long competitive tail.

The undercount caveat. Because this is genuine factory manufacturing — not an industry dominated by government or by one-person operators — the federal statistics capture it reasonably well. But three gaps mean the $6 billion figure understates the market Americans actually buy from:

1. Imports aren't in it. The shipments figure is U.S. factory output. Finished plastic bath units, and especially commodity items like toilet seats, are also imported, so U.S. consumption of these products is larger than U.S. production. Note also that relevant tariff classifications group plastic tubs and showers with unrelated goods, making exact import and export measurement impossible [22].
2. Captive OEM production leaks out. Many plastic and thermoformed bath modules are made inside recreational-vehicle (RV) and manufactured-housing plants and may be counted under those industries rather than here [17].
3. The micro-fabricator tail is thin in the data. Very small cultured-marble and FRP shops sit near the reporting margin.

Cutting the other way: this code is not the whole "bathroom fixtures" market — the much larger metal-fittings and ceramic-fixture categories live in other NAICS codes (see Section 2). Total U.S. demand for plumbing fixtures and fittings across all materials was over $18 billion in 2024 [15]; plastic/fiberglass fixtures are one slice of that.

4. The investable universe

There is no U.S.-listed pure-play plastics-bathware company. The table below shows the realistic exposures — diversified public companies where this is one segment, plus the private owners who actually dominate the category. Tickers, market values, and revenue are for orientation and move with the market.

Public companies (indirect exposure)

Note the pending combination: Lippert (LCII) and Patrick (PATK) announced an all-stock merger on June 30, 2026, creating a ~$8.1 billion-revenue components platform (with about $1.0 billion of adjusted EBITDA — earnings before interest, taxes, depreciation and amortization — including expected synergies). LCI holders would get 1.244 Patrick shares each; the deal is expected to close in the first half of 2027 [16]. For an investor, that concentrates the RV/housing-component exposure into one larger name.

Private and PE-owned owners (where the category really lives)

Bottom line: public-market investors get diluted, indirect exposure; private investors get the pure exposure, mostly through PE funds, direct acquisition of a regional fabricator, or the fast-growing bath-remodel installation channel.

5. How the money works

Owners in 326191 make money the way most durable-goods manufacturers do — buy resin, mold and finish a bulky product, and sell it at a spread — but the specifics matter:

• The input spread is the whole game. The main raw materials are petrochemical: acrylic sheet, polyester and vinyl-ester resins, gelcoat, glass fiber, ABS (acrylonitrile butadiene styrene) sheet, and polyethylene (for portable toilets). Gross margin lives or dies on the gap between selling price and resin cost. Profitability is driven less by resin prices alone than by the timing of price recovery — large retailers, distributors and builders can resist price increases, so if resin, freight, tariff or labor costs rise before selling prices reset, gross margin compresses. The 2025-26 period saw a wave of fixture price increases of roughly 3-15% moving through the channel [18]. Masco's 2025 results attributed pressure on segment profit to higher commodity and tariff costs, lower volume, unfavorable mix, inventory-related costs and marketing investment, partly offset by higher prices and cost savings [5].

• Capacity utilization drives fixed-cost absorption. These are capital- and labor-intensive plants (molds, thermoforming lines, spray booths, hand-layup). Running them full is how you earn a return; a housing downturn that empties the plant crushes profitability fast. Capacity utilization, throughput, and scrap rates are the operating metrics that matter.

• Freight economics create regional moats. A one-piece tub-shower is bulky and low-value-density — expensive to ship relative to its price. That naturally protects domestic makers of large units from imports and pushes the industry toward regional plants located near demand. It also explains the long tail of local fabricators: geography, not brand, often wins the commodity segment.

• Channel mix shapes stability. Sales flow through three channels: (1) retail home centers (Home Depot, Lowe's) and wholesale plumbing distributors, mostly for repair-and-remodel (R&R); (2) builder-direct / new construction; and (3) OEM (original equipment manufacturer) supply to RV and manufactured-housing plants [17]. R&R demand is steadier than new-construction demand; the OEM channel is the most cyclical. Masco identifies repair and remodeling as its primary end market and new construction as secondary [5].

• Remodel pull-through is a growth engine. The "one-day bath remodel" installers (Bath Fitter, Re-Bath, Jacuzzi Bath Remodel, and the like) drop a molded acrylic liner or new unit over an old tub. That business has grown quickly and pulls through demand for the manufacturers' units — and it's where private investors can capture installer-level margins as well.

Key financial levers to watch, then: the resin-to-price spread, capacity utilization, freight cost, and channel mix.

6. What drives demand

• New residential construction. Every new bathroom needs a tub or shower unit; single-family and multifamily housing starts drive the new-construction channel. Privately owned U.S. housing starts were running at a seasonally adjusted annual rate of 1.177 million in May 2026, 8.7% below May 2025 — a headwind for builder-oriented volumes, though remodeling and commercial demand provide offsets [25].
• Repair and remodel (R&R). The bigger, steadier driver. Bathrooms are among the most common remodeling projects, and homeowner improvement spending is large — the Leading Indicator of Remodeling Activity (LIRA) from Harvard's Joint Center for Housing Studies (JCHS) projected annual improvement spending near $518 billion by the end of 2026, growing about 2.4% year-over-year in early 2026 before easing [8]. The median primary-bathroom remodel spend rose to about $15,000 in 2025 [9]. The median U.S. housing-stock age reached 44 years in 2023, a long-duration replacement driver [26].
• Existing-home sales and interest rates. People remodel after they buy; lower mortgage rates lift both home sales and remodeling appetite, and vice versa [8]. Masco lists consumer income and debt, affordability, mortgage and home-equity credit, existing-home sales, home prices, household formation, housing-stock age and skilled-trade availability as relevant demand variables [5].
• Aging in place — a secular tailwind. Roughly 90% of Americans over 65 want to stay in their homes as they age, which drives demand for walk-in tubs, curbless/barrier-free showers, and grab-bar-ready units [8][9]. A Census report found that about 4 million U.S. households containing an adult aged 65 or older had difficulty using some feature of their home in 2019 [27]. This is a durable, demographics-driven source of growth largely independent of the housing cycle.
• Tub-to-shower substitution. In the National Kitchen & Bath Association's 2026 survey, 55% of respondents said a larger shower was more important than retaining a bathtub, with growing interest in curbless entries, seating, steam and other wellness features [28]. This trend can reduce demand for conventional tubs while supporting larger composite shower bases, surrounds and premium shower systems.
• RV and manufactured-housing shipments for the OEM component suppliers [17].
• Commercial and event activity for portable sanitation — construction sites, festivals, disaster response [13].

7. Regulation

• Building and plumbing codes. State and local codes based on the Uniform Plumbing Code (UPC) or International Plumbing Code (IPC) govern which fixtures may be installed and how.
• Product standards and listings. Plastic bath and shower units are built to CSA B45.5/IAPMO Z124 (the principal referenced standard for plastic plumbing fixtures) and related ANSI/ASME standards, and typically carry an IAPMO/UPC listing mark to be sold and installed [29].
• Accessibility. The Americans with Disabilities Act (ADA) and the ICC A117.1 accessibility standard set requirements for roll-in and transfer showers, grab-bar reinforcement, and barrier-free designs — the specifications behind the aging-in-place product boom.
• Air-emissions rules on fiberglass plants — the big compliance cost. Open-mold FRP and gelcoat production emits styrene, a hazardous air pollutant (HAP). The EPA's (Environmental Protection Agency) National Emission Standards for Hazardous Air Pollutants (NESHAP) for Reinforced Plastic Composites Production imposes maximum achievable control technology (MACT) requirements on facilities that use more than about 1.2 tons per year of styrene-containing resins and gelcoats — forcing controls or reformulation to lower-styrene systems [19]. OSHA (Occupational Safety and Health Administration) also limits worker styrene exposure; the agency specifically identifies workers making tubs and showers as potentially exposed and associates exposure with central-nervous-system effects [30]. These rules raise the cost of the FRP process and favor closed-mold and acrylic methods.
• Safety. The Consumer Product Safety Commission (CPSC) and the Virginia Graeme Baker (VGB) Pool and Spa Safety Act govern anti-entrapment drain covers on spas/hot tubs; federally regulated pool and spa drain covers must comply with 16 CFR Part 1450 and the incorporated ANSI/APSP/ICC standard [31]. Slip-resistance and scald protections apply to tubs and showers.
• Water efficiency (mostly adjacent). The EPA's WaterSense labeling and federal water-use standards bite hardest on faucets, showerheads, and toilets — i.e., the metal-fittings and ceramic categories — so they touch this plastic-fixture code less directly.

8. Competitive dynamics and consolidation

The structure is a consolidated top with a fragmented tail. American Bath Group has rolled up many of the well-known bathware brands (Aquatic, MAAX in 2017, Aker, Swan, Clarion, Aquarius, and others) and now holds one of the largest shares in North America, backed by Centerbridge Partners since 2020 [4]. ABG's position strengthened further in 2025 when LIXIL licensed it exclusive North American rights for American Standard, DXV and Eljer bathing products and transferred the Salem, Ohio manufacturing plant [23]. Private equity is the dominant ownership model at scale — Jacuzzi under Investindustrial, American Bath Group under Centerbridge — because the industry throws off steady cash and offers roll-up opportunities among regional fabricators [4][10].

Three dynamics define competition:

1. Freight-protected regionality. Because big units are costly to ship, national brands and local fabricators can coexist; the game is regional plant density and service, not just brand.
2. The big publics play next door. Masco and Fortune Brands are large and profitable but concentrate on metal fittings and faucets, not molded bathware — so they compete in the bathroom broadly without dominating this specific code [5][6].
3. Vertical integration by OEM consolidators. Lippert and Patrick have absorbed component makers (including bath modules) to supply RV and manufactured-housing builders, and their pending merger deepens that model [16][17].

Niche segments run on their own logic: toilet seats are effectively led by one company (Bemis) [12], and portable sanitation is a small, concentrated field (PolyJohn, Satellite) [13][21].

9. Risks

• Housing cyclicality and rate sensitivity. Demand tracks construction and remodeling, both sensitive to mortgage rates and consumer confidence; downturns hit volume and capacity utilization hard [8].
• Resin/input-cost volatility. Petrochemical feedstock swings can outrun a manufacturer's ability to raise prices, squeezing margins [18].
• Freight cost. Bulky, low-density products make the industry freight-exposed; fuel and trucking spikes erode already-thin unit economics.
• Environmental and labor compliance. Styrene emissions rules (EPA NESHAP/MACT) and OSHA exposure limits raise the cost of FRP production and can strand older open-mold plants [19][30].
• Substitution. Tile, porcelain, solid surface, and site-built showers compete with molded units; material and taste shifts can move share.
• Thermoset recycling risk. Cured fiberglass composite material is difficult to remelt or recycle; regulation, retailer procurement policies or customer preferences could favor more recyclable thermoplastics, lower-styrene closed-mold processes or alternative materials.
• Channel concentration. Heavy reliance on a few big-box retailers concedes pricing power to buyers.
• Discretionary deferral. Remodeling is postponable; in a recession, homeowners simply wait.
• Trade policy. Tariffs cut both ways — protecting domestic large-unit makers while raising input and imported-component costs.
• Product liability. Slip-and-fall, scald, and spa-entrapment claims are ongoing exposures.
• Labor scarcity. Shortages of composite workers, finishers and plant-maintenance technicians constrain production, while shortages of remodelers and plumbers can delay end-market projects [26].

10. How to invest, and the outlook

Public-market routes (indirect). There is no pure play, so exposure comes bundled:

• Masco (MAS) and Fortune Brands Innovations (FBIN) give broad bathroom and home-improvement exposure, but mostly through metal fittings and paint rather than molded bathware [5][6].
• Lippert (LCII) and Patrick (PATK) give the most direct molded-bath-unit exposure — as one component line inside RV/housing supply businesses — and are set to merge into a single ~$8.1 billion-revenue company (closing expected first half of 2027) [16][17].
• LIXIL (TSE: 5938) offers global exposure via American Standard and Grohe, though its 2025 transaction transferred important North American bathing production rights and assets to private ABG [23]. An investor wanting this theme in a public portfolio is really buying "U.S. housing and remodeling," not "plastic tubs" specifically.

Private routes (direct). This is where the category's economics are captured cleanly:

• Back or co-invest alongside the PE owners (Centerbridge's American Bath Group, Investindustrial's Jacuzzi) when funds raise.
• Buy a regional fabricator — the fragmented cultured-marble/FRP tail is a classic buy-and-build opportunity, exactly the roll-up American Bath Group executed.
• Own the installation channel — bath-remodel franchises and installers (Bath Fitter, Re-Bath, Jacuzzi Bath Remodel) capture homeowner-level margins and pull through unit demand.

Near-term outlook (forward-looking). The base case is modest, choppy growth. Remodeling activity is expected to keep expanding at a low-single-digit pace into 2026 before softening in late 2026 and early 2027, per LIRA [8] — supportive but not a boom. Housing starts were running 8.7% below year-ago levels as of May 2026, a headwind for builder-oriented volumes [25]. If mortgage rates ease, existing-home sales and remodeling could reaccelerate, lifting the R&R channel [8]. The clearest structural positive is aging-in-place: sustained, demographics-driven demand for accessible showers and walk-in tubs that should grow regardless of the housing cycle [8][9]. The tub-to-shower substitution trend is reshaping product mix, favoring larger shower bases and premium shower systems over conventional tubs [28]. Watch the resin-to-price spread (margin), housing starts and existing-home sales (volume), and the Lippert-Patrick merger (which reshapes the public OEM exposure) [16][18]. Longer term, tighter styrene/emissions rules and freight costs favor scaled operators with modern closed-mold and acrylic processes over the small FRP tail [19].

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Sources

1. U.S. Census Bureau / NAICS Association, "NAICS 2022 Code 326191 — Plastics Plumbing Fixture Manufacturing (definition and product examples)," 2022. https://www.census.gov/naics/?input=326191&year=2022
2. U.S. Census Bureau, "2022 Economic Census — Concentration and Selected Statistics, NAICS 326191" (receipts ~$6.05B; 249 firms; CR4 37.4%, CR8 52.5%, CR20 71.6%, CR50 90.2%; HHI 517.7), 2022. https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau, "County Business Patterns 2023, NAICS 326191" (287 establishments; 18,118 employees; ~$980M annual payroll; ~$243M first-quarter payroll), 2023. https://www.census.gov/programs-surveys/cbp.html
4. American Bath Group, "Our Portfolio / About ABG," 2026. https://americanbathgroup.com/about/abg-brands/
5. Masco Corporation, "Form 10-K, Fiscal Year 2025" (Plumbing Products segment ~$5.0B net sales, ~17.9% operating margin), 2026. https://www.sec.gov/Archives/edgar/data/62996/000006299626000005/mas-20251231.htm
6. Fortune Brands Innovations, Inc., "Form 10-K, Fiscal Year 2024" (Water Innovations net sales ~$2.6B; total revenue ~$4.6B), 2025. https://www.sec.gov/Archives/edgar/data/1519751/000095017025026763/fbin-20241228.htm
7. PR Newswire, "Centerbridge Partners to Acquire American Bath Group," 2020. https://www.prnewswire.com/news-releases/centerbridge-partners-to-acquire-american-bath-group-301148973.html
8. Harvard Joint Center for Housing Studies, "Leading Indicator of Remodeling Activity (LIRA) — Remodeling Growth Set to Downshift in Late 2026," 2026. https://www.jchs.harvard.edu/blog/remodeling-growth-set-downshift-late-2026
9. Houzz, "2026 U.S. Houzz & Home Study: Renovation Trends" (median primary-bath remodel ~$15,000), 2026. https://www.houzz.com/magazine/2026-u-s-houzz-and-home-study-renovation-trends-stsetivw-vs~185090855
10. SpaRetailer, "Investindustrial Completes Acquisition of Jacuzzi Brands," 2023. https://sparetailer.com/investindustrial-completes-acquisition-of-jacuzzi-brands/
11. Kohler Co., "Our Brands — Kitchen & Bath (Kohler, Sterling, Hytec)," 2026. https://www.kohlercompany.com/our-brands/kitchen-bath/
12. Wikipedia, "Bemis Manufacturing Company" (world's largest toilet-seat manufacturer, Sheboygan Falls, WI), 2026. https://en.wikipedia.org/wiki/Bemis_Manufacturing_Company
13. PolyJohn Enterprises, "Manufacturing" (leading portable-restroom manufacturer), 2026. https://www.polyjohn.com/manufacturing
14. U.S. Small Business Administration, "Table of Size Standards, NAICS 326191" (750-employee threshold), 2023. https://www.sba.gov/document/support-table-size-standards
15. The Freedonia Group, "Plumbing Fixtures & Fittings (U.S.)" (total U.S. demand over $18B, all materials, 2024), 2024. https://www.freedoniagroup.com/industry-study/plumbing-fixtures-fittings-us
16. Patrick Industries, Inc. / LCI Industries, "Patrick Industries and LCI Industries to Combine in All-Stock Merger" (June 30, 2026; ~$8.1B combined revenue; 1.244 exchange ratio; close expected H1 2027), 2026. https://ir.patrickind.com/investor-news-events/press-releases/detail/310/
17. Lippert (LCI Industries), "RV Kitchen & Bath — thermoformed ABS/acrylic showers, tubs, and surrounds," 2026. https://corporate.lippert.com/products/rv/kitchen-and-bath
18. First Chair, "Home Renovation Cost Statistics 2026" (fixture price increases ~3-15%, Dec 2025-Feb 2026), 2026. https://www.firstchair.app/blog/home-renovation-cost-statistics
19. U.S. Environmental Protection Agency, "Final NESHAP: Reinforced Plastic Composites Production — Fact Sheet" (styrene MACT; ~1.2 tons/year applicability threshold), 2015/2019. https://www.epa.gov/sites/production/files/2015-11/documents/final_neshap_reinforced_plastic_composites_production_-_fact_sheet.pdf
20. U.S. Environmental Protection Agency, "Shower Stall and Bathtub Manufacturing Study" (process description, styrene emission sources), 2015. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100LUN7.TXT
21. Satellite Industries, "About Us" (largest manufacturer of portable restrooms), 2026. https://satelliteindustries.com/about-us
22. American Composites Manufacturers Association, "ACMA Targets Statistics Flaws" (tariff classifications group plastic tubs/showers with unrelated goods), 2024. https://acmanet.org/acma-targets-statistics-flaws/
23. LIXIL Corporation, "LIXIL Licenses American Standard, DXV and Eljer Bathing Products to American Bath Group," 2025. https://newsroom.lixil.com/20250402?hs_amp=true
24. Sterling (Kohler), "Vikrell Manufacturing and Products" (composite tubs/showers, Alabama and Arizona plants), 2026. https://sterling.kohler.com/en/products/vikrell
25. U.S. Census Bureau, "New Residential Construction" (housing starts 1.177M SAAR May 2026, −8.7% YoY), 2026. https://www.census.gov/construction/nrc/current/
26. Harvard Joint Center for Housing Studies, "Improving America's Housing 2025" (median housing-stock age 44 years; labor shortages), 2025. https://www.jchs.harvard.edu/press-releases/remodeling-soars-new-heights-industry-struggles-address-labor-shortages-and-urgent
27. U.S. Census Bureau, "Aging-Ready Homes Report" (~4M households with 65+ adult had difficulty using home features, 2019), 2023. https://www.census.gov/newsroom/press-releases/2023/aging-ready-homes.html
28. National Kitchen & Bath Association, "2026 Bath Trends Report" (55% prefer larger shower over bathtub; curbless, seating, wellness features), 2026. https://nkba.org/press/nkba-kbis-releases-annual-2026-bath-trends-report/
29. IAPMO, "Formal Interpretation — CSA B45.5/IAPMO Z124" (principal standard for plastic plumbing fixtures), 2021. https://www.iapmo.org/media/ovdoq0lo/formal-interpretation-csa-b455plusiapmo-z124-2017-2021-02.pdf
30. Occupational Safety and Health Administration, "Styrene" (worker exposure in tub/shower manufacturing, CNS effects), 2026. https://www.osha.gov/styrene
31. Consumer Product Safety Commission, "Pool and Spa Drain Covers" (16 CFR Part 1450, ANSI/APSP/ICC standard), 2026. https://www.cpsc.gov/Business--Manufacturing/Business-Education/Business-Guidance/Pool-and-Spa-Drain-Covers