| Business | Phone |
| American Trading & Logistics 315 S Haven St, Baltimore 21224 | (410) 732-9957 |
| Baltimore Pipe Inc 3233 Vera St, Baltimore 21226 | (410) 355-4111 |
| D-S Pipe & Supply Co 1301 Wicomico St, Baltimore 21230 | (410) 539-8000 |
| Hajoca Corp 4730 Hollins Ferry Rd, Baltimore 21227 | (410) 242-8990 |