| Charlotte Pipe & Foundry (Cameron, TX)
|
| Charlotte Pipe & Foundry (Clover, SC)
|
| Charter Plastics (Titusville, PA)
|
| Clow Water Systems Co (Dexter, MI)
|
| Co-Ex Pipe Co (Big Spring, TX)
|
| Conley Corp (Tulsa, OK)
|
| Construction Consultants (Millersville, MD)
|
| Contech Construction Prods Inc (Charleston, SC)
|
| Cresline Plastic Pipe Co (Henderson, KY)
|
| Cresline West (Phoenix, AZ)
|
| Crown Line Plastics (Nebraska City, NE)
|
| Crumpler Plastic Pipe Inc (Roseboro, NC)
|
| DARA Inc (Lebanon, PA)
|
| Deepflex (Houston, TX)
|
| Diamond Plastics Corp (Lubbock, TX)
|
| Diamond Plastics Corp (Grand Island, NE)
|
| Dom Plastic Co (Saint Anne, IL)
|
| Dura-Line (Richardson, TX)
|
| Dura-Line Corp (Sparks, NV)
|
| Eastern Precast Co Inc (Brookfield, CT)
|
| Emmsa Co (McAllen, TX)
|
| Endot Industries Inc (South Point, OH)
|
| F W Webb Co (Amherst, NH)
|
| Ferguson Waterworks Crow Co (Tucson, AZ)
|
| Fiber Glass Systems Lp (San Antonio, TX)
|
