| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Insul-Tek Piping System Inc. | USA | |
| 2 | Conley Corp. | USA | |
| 3 | PHPK Technologies | USA | |
| 4 | JTI Companies Inc. | USA | |
| 5 | M.C. Fabrications | USA | |
| 6 | Walbert Plastics Inc. | USA | |
| 7 | Molded Fiberglass Products Co. Inc. | USA | |
| 8 | Perma-Pipe/Ricwil | USA | |
| 9 | Insulated Piping Systems Inc. | USA | |
| 10 | Environ Products Inc. | USA | |
| 11 | Tamarink | USA | |
| 12 | Plastic Pipe & Supply Inc. | USA | |
| 13 | Asahi/America Inc. | USA | |
| 14 | IPEX | USA | |
| 15 | Composites USA | USA | |
| 16 | ACO Polymer Products Inc. | USA | |
| 17 | Perma-Pipe Inc. | USA | |
| 18 | Pena-Plas Co. | USA | |
| 19 | Argos Corp. | USA | |
| 20 | Controls Southeast Inc. | USA | |
| 21 | Simtech Process Systems | USA | |
| 22 | Piping Systems Inc. | USA | |
| 23 | Satterlund Supply Co. | USA | |
| 24 | Georg Fischer LLC | USA | |
| 25 | Envirocon Systems Inc. | USA | |
| 26 | Apex Piping Systems Inc. | USA | |
| 27 | Calpico Inc. | USA | |
| 28 | Pipefusion Services Inc. | USA | |
| 29 | Plastic Depot | USA | |
| 30 | Ultraflo Systems Inc | USA | |
| 31 | Drossbach LLC | USA | |
| 32 | Orion Fittings | USA | |
| 33 | Sue-Jac Inc. | USA | |
| 34 | ISCO Industries LLC | USA | |
| 35 | Centek Industries Inc. | USA | |
| 36 | Prinsco Inc. | USA | |
| 37 | Channel-Track & Tube-Way Industries Inc. | USA |
