| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Naylor Pipe Co. | USA | |
| 2 | Chicago Metal Rolled Products Co. | USA | |
| 3 | AGRU America Inc. | USA | |
| 4 | Arntzen Pipe | USA | |
| 5 | Proco Products Inc. | USA | |
| 6 | Dredgemasters International Inc. | USA | |
| 7 | Hobas Pipe USA | USA | |
| 8 | Arntzen Corp. | USA | |
| 9 | MRC Global | USA | |
| 10 | U.S. Industrial Piping Inc. | USA | |
| 11 | Piping Systems Inc. | USA | |
| 12 | Oxford Plastics Inc. | USA | |
| 13 | Ims Dredges | USA | |
| 14 | OPS Sales Company | USA | |
| 15 | Berg Steel Pipe Corp. | USA | |
| 16 | Dredging Supply Co. Inc. | USA | |
| 17 | American Spiralweld Pipe Co. LLC | USA | |
| 18 | ISCO Industries LLC | USA | |
| 19 | Heintz Steel & MFG. Co. | USA | |
| 20 | American Marine & Machinery Co Inc. | USA | |
| 21 | W & S Development Inc. | USA | |
| 22 | Dixie Dredge Co. | USA |
