| Business | Phone |
| A L Hacker Co Inc 7606 Eastern Ave, Baltimore 21224 | (410) 686-9300 |
| Atlantic Valve & Supply Co 3541 9th St, Baltimore 21225 | (410) 355-8270 |
| N B Cochrane Co 9330 Pulaski Hwy, Baltimore 21220 | (410) 686-8888 |
| Proconex 809 Glen Eagles Ct # 203, Baltimore 21286 | (410) 597-9000 |
| Pratt Thompson Co 1900 S Charles St, Baltimore 21230 | (410) 727-6826 |
| Griffin Pipe Products Co Baltimore 21237 | (410) 238-2499 |