NAICS 326122

Overview

The North American Industry Classification System (NAICS) is the federal standard for classifying business establishments to enable consistent collection, analysis, and publication of U.S. economic statistics. Established by the Office of Management and Budget in 1997 to replace SIC, it was developed jointly with Statistics Canada and Mexico’s INEGI to support comparable North American statistics. ¹

NAICS 326122 — Plastics Pipe and Pipe Fitting Manufacturing — covers establishments primarily engaged in converting plastics resins into rigid plastics pipes and pipe fittings. It excludes plastics hose and belting, plastics plumbing fixtures, and noncurrent-carrying plastics conduit, which are classified in other industries. These boundaries matter when assigning codes in procurements or economic reporting. ²

• See also on G2X:
  • G2X — Industry group 32612 (Plastics Pipe, Pipe Fitting, and Unsupported Profile Shape Manufacturing)
  • G2X — PSC 4710

What this NAICS covers

• Manufacturing rigid plastics pipe from plastics resins. ²
• Manufacturing plastics pipe fittings (e.g., elbows, couplings). ²
• Converting plastics resins into finished rigid pipe and pipe fittings for piping systems. ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	326121	Unlaminated Plastics Profile Shape Manufacturing
NAICS	326191	Plastics Plumbing Fixture Manufacturing
PSC	4710	Pipe, Tube, and Rigid Tubing
PSC	4730	Fittings and Specialties; Hose, Pipe, and Tube

NAICS items reflect Census cross-references for this industry. ²

PSC selections reflect the current Product and Service Code Manual. ³

Boundaries and official cross‑references

• Plastics hose and belting are excluded; see 326220. ²
• Noncurrent‑carrying plastics conduit is excluded; see 335932. ²
• Plastics plumbing fixtures are excluded; see 326191. ²
• Plastics film, unlaminated sheet, and bags are excluded; see 32611. ²

NAICS 2022 vintage and use in federal statistics

Census programs are transitioning outputs from 2017 NAICS to the 2022 NAICS vintage on a program-by-program schedule through 2027, with initial 2022-basis results appearing in Economic Census releases. Users should account for vintage differences when trending data for 326122 across years. ⁴

Frequently asked questions

• Is PVC or CPVC pipe specifically identified under 326122?
  The official definition covers “rigid plastics pipes and pipe fittings” made by converting plastics resins and does not enumerate resin families (e.g., PVC, CPVC, HDPE). Classification depends on the product form (rigid pipe or fitting), not resin name. Not specified by official sources. ²

• Are plastic electrical conduits classified here?
  No. Noncurrent-carrying plastics conduit is classified under 335932 (Noncurrent-Carrying Wiring Device Manufacturing), not 326122. This keeps electrical conduit separate from fluid-conveyance pipes and fittings. ²

• What is the difference between 326122 and 326121?
  326122 covers rigid plastics pipes and pipe fittings. 326121 covers unlaminated plastics profile shapes (e.g., rod, tube, and other unsupported profiles) other than film, sheet, and bags. The distinction is based on product form and end use. ²

• Which PSCs typically apply to plastic pipe and fittings in federal buys?
  Plastic pipe and rigid tubing often map to PSC 4710, and associated fittings commonly map to PSC 4730. Agencies should verify item-specific descriptions against the PSC Manual’s definitions when coding line items. ³

Useful resources

• G2X — NAICS 326122 overview: https://app.g2xchange.com/naics/326122
• Census — NAICS main site and introduction. ¹
• Census — NAICS 326122 definition and cross‑references (Sector 31–33 archive view). ²
• Census — 2022 NAICS implementation timeline and adoption across programs. ⁴

References

1. U.S. Census Bureau — North American Industry Classification System (NAICS) main page (Introduction). https://www.census.gov/naics
2. U.S. Census Bureau — NAICS Sector 31–33 definitions (includes 326122 text and cross‑references). https://www.census.gov/naics/resources/archives/sect31-33.html
3. General Services Administration — Product and Service Code (PSC) Manual (current and archived manuals). https://www.acquisition.gov/psc-manual/all
4. U.S. Census Bureau — The Census Bureau’s Implementation of the 2022 NAICS (timeline and notes). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html