| Business | Phone |
| Able Distributors 2501 N Central Ave, Chicago 60639 | (773) 237-0898 |
| Amcor 3230 W 31st St, Chicago 60623 | (773) 254-6619 |
| Andy's Heating & Sheet Metal 6115 W Belmont Ave, Chicago 60634 | (773) 287-1579 |
| Avenue Metal Mfg Co 1640 W Ogden Ave, Chicago 60612 | (312) 243-3483 |
| Belvin-J & F Sheet Metal 675 N Milwaukee Ave, Chicago 60622 | (312) 666-5222 |
| C & B Welders Inc 2645 W Monroe St, Chicago 60612 | (773) 722-0097 |
| Fanmar Inc 6601 S Sayre Ave, Chicago 60638 | (708) 563-0505 |
| Chicago Blow Pipe Co 2710 W Lake St, Chicago 60612 | (773) 533-6100 |
| Chicago Copper & Iron Works 3118 N Clybourn Ave, Chicago 60618 | (773) 472-9283 |
| Edon Steel Specialties 2223 S Millard Ave, Chicago 60623 | (773) 522-1155 |
| Drehobl Heating & Sheet Metal 5407 N Magnet Ave, Chicago 60630 | (773) 774-2608 |
| George Dolacki 3119 W 59th St, Chicago 60629 | (773) 776-2266 |
| Cleats Manufacturing Co 1701 S Kostner Ave, Chicago 60623 | (773) 542-0453 |
| Cleats Manufacturing Co 1855 S Kilbourn Ave, Chicago 60623 | (773) 521-0300 |
| D & J Metal Craft 4451 N Ravenswood Ave, Chicago 60640 | (773) 878-6446 |
| Corrugated Metal 4800 S Hoyne Ave, Chicago 60609 | (773) 650-1390 |
| Gran-Adell Mfg Co 1111 W Winona St, Chicago 60640 | (773) 769-4200 |