- Appalachian Piping Products
- Augusta Fiberglass Coating Inc
- Available Plastics Inc
- Bittner Industries Inc
- Colorite Plastics
- Diamond Plastics
- DOMCO Plastics
- Excalibur Extrusion Inc
- Excalibur Extrusion Inc
- Genova Nv Inc
- George Fisher Sloane Inc
- Hantech
- Hawk Plastics Inc
- Home & Garden Industries Inc
- Industrial Pipe & Plastic
- Interstate Plastic Inc
- National Pipe & Plastics Inc
- North American Pipe Corp
- North American Pipe Corp
- Oregon Plastic Tubing
- Polystar
- Portage Specialty Co
- Rinker MATERIALS Poly Pipe
- Sofanou Of Texas
- US Poly Co
- Western Ag Mfg Co
