| Business | Phone |
| Atlas Tube Inc 1855 E 122nd St, Chicago 60633 | (773) 646-4500 |
| Naylor Pipe Co 1230 E 92nd St, Chicago 60619 | (773) 721-9400 |
| Independence Tube Corp 6226 W 74th St, Chicago 60638 | (708) 496-0380 |
| Leavitt Tube Co Inc 1717 W 115th St, Chicago 60643 | (773) 239-7700 |
| Metal-Matic Inc 7200 S Narragansett Ave, Chicago 60638 | (708) 594-7553 |