| 1 | United Pipe Nipple Company | | USA |
| 2 | Mayco Industries | | USA |
| 3 | Ultraflo Systems Inc | | USA |
| 4 | Specialty Metals Inc. | | USA |
| 5 | New Fab Inc. | | USA |
| 6 | Continental Fabricators Inc. | | USA |
| 7 | Rovanco Piping Systems Inc | | USA |
| 8 | Atlas Tube Inc. | | USA |
| 9 | Fibrex | | USA |
| 10 | American Spiralweld Pipe Co. LLC | | USA |
| 11 | ICSE | | USA |
| 12 | Piping Technology & Products Inc. | | USA |
| 13 | Advanced Drainage Systems Inc. | | USA |
| 14 | ISCO Industries LLC | | USA |
| 15 | American Cast Iron Pipe Company | | USA |
| 16 | Industrial Pipe & Plastics Inc. | | USA |
| 17 | O’Connor Tanks Ltd. | | USA |
| 18 | Continental Pipe Mfg. Co. Div. of Arrow Tank Co. | | USA |
| 19 | Scot Hone Corp. | | USA |
| 20 | Perma-Pipe Inc. | | USA |
| 21 | Valiant Steel | | USA |
| 22 | ABT Inc. | | USA |
| 23 | Honematic Machine Corp. | | USA |
| 24 | Federal Steel Supply Inc. | | USA |
| 25 | Kottler Metal Products Inc. | | USA |
| 26 | Flexible Valve Corp. | | USA |
| 27 | Titanium Fabrication Corp. Phoenix Group | | USA |
| 28 | Stainless Specialties Inc. | | USA |
| 29 | National Tube Supply | | USA |
| 30 | Dynamic Products Inc. | | USA |
| 31 | H-P Products Inc. | | USA |
| 32 | Arntzen Corp. | | USA |
| 33 | J & D Tube Benders Inc. | | USA |
| 34 | Diamond Plastics Corp. | | USA |
| 35 | Cooney Brothers Inc. | | USA |
| 36 | Pipefusion Services Inc. | | USA |
| 37 | Pena-Plas Co. | | USA |
| 38 | Corrosion Materials | | USA |
| 39 | Charlotte Pipe & Foundry Co. | | USA |
| 40 | MRC Global | | USA |
| 41 | Steel Forgings Inc. | | USA |
| 42 | Composites USA | | USA |
| 43 | InfraPipe Solutions LTD | | USA |
| 44 | Arntzen Pipe | | USA |
| 45 | Naylor Pipe Co. | | USA |
| 46 | Emco Industrial Plastics Inc. | | USA |
| 47 | Infra-Metals Co. | | USA |
| 48 | Eagle Stainless Tube & Fabrication Inc. | | USA |
| 49 | Metal Works Corp. | | USA |
| 50 | Chicago Metal Rolled Products Co. | | USA |
| 51 | Reliable Source Inc. | | USA |
| 52 | International Tank & Pipe Co. | | USA |
| 53 | Precision Welding & Fabrication | | USA |
| 54 | Qualicast Corp. | | USA |
| 55 | Global Metals | | USA |
| 56 | Southeast Texas Industries Inc. | | USA |
| 57 | Energy Steel & Supply Co. | | USA |
| 58 | Scot Industries | | USA |
| 59 | Coremark Metals | | USA |
| 60 | AGRU America Inc. | | USA |
| 61 | Piping Systems Inc. | | USA |
| 62 | Corr Tech Inc. | | USA |
| 63 | Island Fitting | | USA |
| 64 | Aquatherm | | USA |
| 65 | Town & Country Plastics Inc. | | USA |
| 66 | Mannesmann DMV Stainless | | USA |
| 67 | Cust-O-Bend | | USA |
| 68 | U.S. Industrial Piping Inc. | | USA |
| 69 | Maruichi Leavitt Pipe & Tube LLC | | USA |
