| 1 | Amsted Canada Inc. | | USA |
| 2 | Lee Co. The | | USA |
| 3 | EBAA Iron Inc. | | USA |
| 4 | Higgins Engineering Inc. | | USA |
| 5 | Excello Tool Co. Inc. | | USA |
| 6 | Kuhlman Corp. | | USA |
| 7 | Sewickley Construction Products Inc. | | USA |
| 8 | Dura-Bar | | USA |
| 9 | NewAge Casting | | USA |
| 10 | Lohman Metals | | USA |
| 11 | Pacific States Cast Iron Pipe Co. | | USA |
| 12 | Rundle-Spence Manufacturing Co. | | USA |
| 13 | Prescott Everett J. Inc. | | USA |
| 14 | Fonderies Bibby-Ste-Croix | | USA |
| 15 | Silent Glide Pipehanger Corp. | | USA |
| 16 | Wyoming Concrete Industries Inc. | | USA |
| 17 | Atlantic States Cast Iron Pipe Co. | | USA |
| 18 | Process Systems Inc | | USA |
| 19 | Penn Stainless Products Inc. | | USA |
| 20 | Beartech Alloys Inc. | | USA |
| 21 | A-1 Alloys | | USA |
| 22 | Reliable Source Inc. | | USA |
| 23 | PEP A Ryan Herco Flow Solutions Company | | USA |
| 24 | Dura-Line Corp. | | USA |
| 25 | Cooney Brothers Inc. | | USA |
| 26 | Southern Metal Resources LLC | | USA |
| 27 | Everett J. Prescott Inc. | | USA |
| 28 | DBJ Corporation | | USA |
| 29 | C.I. Thornburg Co. Inc. | | USA |
| 30 | Kieft Brothers Incorporated | | USA |
| 31 | Charlotte Pipe & Foundry Co. | | USA |
| 32 | Manning Enterprises | | USA |
| 33 | American Iron & Alloys LLC. | | USA |
| 34 | Techni-Cast Corp. | | USA |
| 35 | Diamond Plastics Corp. | | USA |
| 36 | Holloway Co. Inc. | | USA |
| 37 | Ultraflo Systems Inc | | USA |
| 38 | Tyler Pipe Industries Inc. | | USA |
| 39 | Channel-Track & Tube-Way Industries Inc. | | USA |
| 40 | United Pipe Nipple Company | | USA |
| 41 | Tyler Pipe Co. | | USA |
| 42 | American Cast Iron Pipe Co. (ACIPCO) | | USA |
| 43 | American Cast Iron Pipe Company | | USA |
