| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Reliable Source Inc. | USA | |
| 2 | Detroit Nipple Works Inc. | USA | |
| 3 | ABT Inc. | USA | |
| 4 | Merit Brass Co. | USA | |
| 5 | Gs-Hydro US Inc. | USA | |
| 6 | United Pipe Nipple Company | USA | |
| 7 | Frederiks Machine & Tool Co. Inc. | USA | |
| 8 | J & D Tube Benders Inc. | USA | |
| 9 | Kottler Metal Products Inc. | USA | |
| 10 | GreenMount Corp. | USA | |
| 11 | Warsaw Engineering & Fabricating Inc. | USA | |
| 12 | Freedom Metals Inc. | USA | |
| 13 | ANSYS Inc. | USA | |
| 14 | Hydraulic Specialty Inc. | USA |
