| 1 | Naylor Pipe Co. | | USA |
| 2 | Asahi/America Inc. | | USA |
| 3 | Appleton Stainless | | USA |
| 4 | WL Plastics Corp. | | USA |
| 5 | International Tank & Pipe Co. | | USA |
| 6 | WS Hampshire Inc. | | USA |
| 7 | Westlake Pipe & Fittings | | USA |
| 8 | AGRU America Inc. | | USA |
| 9 | Future Pipe Industries | | USA |
| 10 | Crane CPE | | USA |
| 11 | Springfield Plastics Inc. | | USA |
| 12 | Sewickley Construction Products Inc. | | USA |
| 13 | Simtech Process Systems | | USA |
| 14 | Creative Urethanes Inc. | | USA |
| 15 | United Pipe Nipple Company | | USA |
| 16 | Pipefusion Services Inc. | | USA |
| 17 | InfraPipe Solutions LTD | | USA |
| 18 | Pipeline Plastics | | USA |
| 19 | Appalachian Piping Products Inc. | | USA |
| 20 | Copeland Supply Co. Inc. | | USA |
| 21 | Oxford Plastics Inc. | | USA |
| 22 | Solmax International Inc. | | USA |
| 23 | Advanced Drainage Systems Inc. | | USA |
| 24 | Medallion Pipe Supply | | USA |
| 25 | Sharon Tube Co. | | USA |
