| Network Piping Inc (Coventry, RI)
|
| Non Metallic Resources Inc (Mobile, AL)
|
| North American Pipe Corp (Booneville, MS)
|
| North American Pipe Corp (Greensboro, GA)
|
| Northern Water Works Supply (Bismarck, ND)
|
| Northtown Co (Huntington Beach, CA)
|
| O'Brien (Redmond, WA)
|
| Oregon Plastic Tubing (Hubbard, OR)
|
| Petro Flex North America Ltd (Gainesville, TX)
|
| Phillips Driscopipe Inc (Hagerstown, MD)
|
| Plastic Pipe & Supply Inc (Cranston, RI)
|
| Plastic Tubing Industries Inc (Apopka, FL)
|
| Poly Pro (Pryor, OK)
|
| Poly Warehouse Inc (Stevensville, MT)
|
| Polystar Llc (Dalton, GA)
|
| Popp Binding & Laminating Inc (Lidgerwood, ND)
|
| Pps Plastic Pipe & Supply (San Clemente, CA)
|
| Pre-Con Products Ltd (Simi Valley, CA)
|
| Preformance Pipe (Auburn, MA)
|
| Pw Eagle Inc (Perris, CA)
|
| Rinker Materials Poly Pipe Inc (Gainesville, TX)
|
| Rocky Mountain Pipe Co (Denver, CO)
|
| Salta Pipe Co (Abilene, TX)
|
| Samson Plastic Pipe Inc (Samson, AL)
|
| Sanderson Pipe Corp (Sanderson, FL)
|
