| Plumbers Steamfitters and Service | Related tax-exempt org | Part VII | WI | 391618586 |
| AIR Quality Controls LLC | Related taxable corporation/trust | — | — | — |
| August Winter & SONS | Related taxable corporation/trust | — | — | — |
| AZCO INC | Related taxable corporation/trust | — | — | — |
| Harris Contracting CO | Related taxable corporation/trust | — | — | — |
| Jamar Company | Related taxable corporation/trust | — | — | — |
| Kuhlman Incorporated | Related taxable corporation/trust | — | — | — |
| MJ Electric | Related taxable corporation/trust | — | — | — |
| Monona Plumbing | Related taxable corporation/trust | — | — | — |
| Summit Refrigeration Group | Related taxable corporation/trust | — | — | — |
| Tweet Garot Mechanical | Related taxable corporation/trust | — | — | — |
| City Brewing LLC | Related taxable corporation/trust | — | — | — |
| CFM VR Tesco LLC | Related taxable corporation/trust | — | — | — |
| Coulee Region Mechanical | Related taxable corporation/trust | — | — | — |
| Countryside PLBG & HTG | Related taxable corporation/trust | — | — | — |
| D&M Mechanical INC | Related taxable corporation/trust | — | — | — |
| HJ Pertzborn | Related taxable corporation/trust | — | — | — |
| Halverson Brothers INC | Related taxable corporation/trust | — | — | — |
| Hengel Brothers | Related taxable corporation/trust | — | — | — |
| S&S Mechanical LLC | Related taxable corporation/trust | — | — | — |
| Hovlands INC | Related taxable corporation/trust | — | — | — |
| KNG Mechanical INC | Related taxable corporation/trust | — | — | — |
| Siemens Building Technology | Related taxable corporation/trust | — | — | — |
| Metropolitan Mechanical | Related taxable corporation/trust | — | — | — |
| Prime Source Plumbing | Related taxable corporation/trust | — | — | — |