| 1 | De Dietrich Process Systems Inc. | | USA |
| 2 | CK Composites LLC. | | USA |
| 3 | Pena-Plas Co. | | USA |
| 4 | Creative Urethanes Inc. | | USA |
| 5 | Atlantic Screen & Mfg. Inc. | | USA |
| 6 | ALTAFLO | | USA |
| 7 | United Pipe Nipple Company | | USA |
| 8 | Charlotte Pipe & Foundry Co. | | USA |
| 9 | A Metal Source LLC | | USA |
| 10 | Calpipe Industries – Calbrite | | USA |
| 11 | Advanced Drainage Systems Inc. | | USA |
| 12 | Emco Industrial Plastics Inc. | | USA |
| 13 | California Metal & Supply Inc. | | USA |
| 14 | Asahi/America Inc. | | USA |
| 15 | A-1 Alloys | | USA |
| 16 | IPEX | | USA |
| 17 | WL Plastics Corp. | | USA |
| 18 | Contech Engineered Solutions LLC | | USA |
| 19 | WS Hampshire Inc. | | USA |
| 20 | NIBCO | | USA |
| 21 | IPEX | | USA |
| 22 | Victrex USA Inc. | | USA |
| 23 | Crane CPE | | USA |
| 24 | Aquatherm | | USA |
| 25 | Tube Methods Inc. | | USA |
| 26 | Tantaline | | USA |
| 27 | Fab-Tech Inc. | | USA |
| 28 | Simtech Process Systems | | USA |
| 29 | Mammoth Carbon Products | | USA |
| 30 | Miller Plastic Products Inc. | | USA |
| 31 | Corrosion Products Inc. | | USA |
| 32 | Farmer’s Marine Copper Works Inc. | | USA |
| 33 | Cooney Brothers Inc. | | USA |
| 34 | Tempest Inc. | | USA |
| 35 | Georg Fischer LLC | | USA |
| 36 | Coltwell Industries | | USA |
