Includes
Concrete Pipe and Conduit; Clay Pipe and Conduit for underground use; Drain Tile; Nonmetallic Pipe Fittings for underground use.

Excludes
Nonmetallic Pipe, Conduit, and Fittings for laboratory or electrical use; Hose and Tubing, Flexible Nonmetallic.

Possible NAICS Codes
326122 – Plastics Pipe and Pipe Fitting Manufacturing
332996 – Fabricated Pipe and Pipe Fitting Manufacturing
423720 – Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers
327332 – Concrete Pipe Manufacturing
237110 – Water and Sewer Line and Related Structures Construction
423610 – Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers
444130 – Hardware Stores
332919 – Other Metal Valve and Pipe Fitting Manufacturing
327390 – Other Concrete Product Manufacturing
423390 – Other Construction Material Merchant Wholesalers