| Business | Phone |
| Calumet Rubber Mfg Corp 3545 S Normal Ave, Chicago 60609 | (773) 536-6350 |
| Chambers Gasket & Mfg Co 4701 W Rice St, Chicago 60651 | (773) 626-8800 |
| Chicago Gasket Co 1285 W North Ave, Chicago 60622 | (773) 486-3060 |
| Hennig & Gasket & Seals Inc 2350 W Cullerton St, Chicago 60608 | (312) 243-8270 |
| W H Salisbury & Co 401 N Morgan St, Chicago 60622 | (312) 421-4850 |