| 1 | Pacific Plastics Inc. | | USA |
| 2 | Hydroseal Canada | | USA |
| 3 | Forterra Pipe & Precast | | USA |
| 4 | Canmec Group | | USA |
| 5 | Blue Diamond Industries LLC | | USA |
| 6 | Vianini Pipe Inc. | | USA |
| 7 | ECC Corrosion | | USA |
| 8 | Reheau Industries Inc. | | USA |
| 9 | Ron Faust Welding | | USA |
| 10 | Asahi/America Inc. | | USA |
| 11 | MAXPRO Technologies Inc. | | USA |
| 12 | IPEX | | USA |
| 13 | Naylor Pipe Co. | | USA |
| 14 | WL Plastics Corp. | | USA |
| 15 | Busada Manufacturing Corporation | | USA |
| 16 | Tricon Piping Systems Inc. | | USA |
| 17 | Westlake Pipe & Fittings | | USA |
| 18 | IPEX | | USA |
| 19 | AGRU America Inc. | | USA |
| 20 | JM Eagle | | USA |
| 21 | Georg Fischer LLC | | USA |
| 22 | Aquatherm | | USA |
| 23 | Tube Methods Inc. | | USA |
| 24 | Duraflex Inc. Metal Bellows | | USA |
| 25 | Simtech Process Systems | | USA |
| 26 | Summerill Tube Corp. | | USA |
| 27 | Webco | | USA |
| 28 | United Pipe Nipple Company | | USA |
| 29 | ABT Inc. | | USA |
| 30 | Diamond Plastics Corp. | | USA |
| 31 | Pipeline Plastics | | USA |
| 32 | Charlotte Pipe & Foundry Co. | | USA |
| 33 | Oxford Plastics Inc. | | USA |
| 34 | Composite Fluid Transfer LLC. | | USA |
