| 1 | Iron World Manufacturing LLC | | USA |
| 2 | Sterling Pipe & Tube Inc. | | USA |
| 3 | WSM Industries | | USA |
| 4 | Cooney Brothers Inc. | | USA |
| 5 | Federal Steel Supply Inc. | | USA |
| 6 | United Pipe Nipple Company | | USA |
| 7 | Duct Inc. | | USA |
| 8 | Diversified Air Systems | | USA |
| 9 | Quality Pipe Products Inc. | | USA |
| 10 | Wil-Loc Industrial Plumbing | | USA |
| 11 | Koger Air Corporation | | USA |
| 12 | Piping Systems Inc. | | USA |
| 13 | Security Fabricators Inc. | | USA |
| 14 | Delta AC Supply | | USA |
| 15 | Bushwick Metals LLC | | USA |
| 16 | AZCO Steel Company A Division of Bushwick Metals LLC | | USA |
| 17 | Stainless Specialties Inc. | | USA |
| 18 | Crest Steel Corp. | | USA |
| 19 | DBJ Corporation | | USA |
| 20 | Wheatland Tube Co. | | USA |
| 21 | PDM Steel Service Centers Inc. | | USA |
| 22 | Lane Enterprises Inc. | | USA |
| 23 | Perma-Pipe Inc. | | USA |
| 24 | DC Duct & Sheet Metal | | USA |
| 25 | Alum-Elec Structures Inc. | | USA |
| 26 | Detroit Nipple Works Inc. | | USA |
| 27 | K & K Enterprises Inc. | | USA |
| 28 | H-P Products Inc. | | USA |
| 29 | The Pipe Yard | | USA |
| 30 | Mid-Supply Co. | | USA |
| 31 | Haviland Drainage Products Inc. | | USA |
| 32 | ICSE | | USA |
| 33 | Famous Supply Co. | | USA |
| 34 | Mil-Spec Industries | | USA |
| 35 | U.S. Industrial Piping Inc. | | USA |
| 36 | Surveyors Materials Inc | | USA |
| 37 | Advanced Drainage Systems Inc. | | USA |
| 38 | Mitchell Metal Products | | USA |
| 39 | Rovanco Piping Systems Inc | | USA |
| 40 | Show-Ease Stall Co. | | USA |
| 41 | Essve Tech Inc | | USA |
| 42 | Francer Industries Inc. | | USA |
| 43 | De La Garza Fence Co. Inc. | | USA |
| 44 | Piping Technology & Products Inc. | | USA |
| 45 | Les Industries Mecatube Ltee | | USA |
| 46 | Youngstown Tube Company | | USA |
| 47 | Culverts Inc. | | USA |
| 48 | American Security Fence Corp. | | USA |
| 49 | Midwest Spiro Pipe Co. Inc. | | USA |
| 50 | Infra-Metals Co. | | USA |
| 51 | Xylem Inc. | | USA |
| 52 | Morris Coupling Co. | | USA |
| 53 | A-1 Alloys | | USA |
| 54 | Valmont Tubing | | USA |
| 55 | Indventech | | USA |
| 56 | Reliable Source Inc. | | USA |
| 57 | Contech Engineered Solutions LLC | | USA |
| 58 | Honeyville Metal | | USA |
| 59 | Nordfab Ducting | | USA |
| 60 | SAE Manufacturing Specialties Corp | | USA |
| 61 | Mega Steel & Tube | | USA |
| 62 | The Tin Knockers Industrial | | USA |
| 63 | Macuch Steel Products Inc. | | USA |
| 64 | Mueller Streamline Co. | | USA |
| 65 | Southeast Texas Industries Inc. | | USA |
| 66 | Kee Safety Inc. | | USA |
| 67 | Grant Steel | | USA |
| 68 | ProVent LLC | | USA |
| 69 | MRC Global | | USA |
| 70 | Sewickley Construction Products Inc. | | USA |
| 71 | Millennium Steel and Rack Rentals Inc. | | USA |
| 72 | Jolin Concrete Ind Inc. | | USA |
| 73 | AK Tube LLC | | USA |
| 74 | Air Dynamics Industrial Systems Corp. | | USA |
