| Business | Phone |
| Beal Equipment Inc Po Box 39086, Denver 80239 | (303) 340-4400 |
| Eggelhof Inc 6330 Washington St # 12, Denver 80216 | (303) 288-0227 |
| Filtersource Denver 80219 | (303) 232-8590 |
| National Filter Media 7983 E Bucknell Pl, Denver 80231 | (303) 755-2905 |
| Process Technologies 10515 E 40th Ave, Denver 80239 | (303) 375-1230 |