| Steamfitters Local #475 Vacation Fund | Related tax-exempt org | Provides vacation benefits to members. | NJ | 222351279 |
| Steamfitters Local #475 Education Fund | Related tax-exempt org | Provides training and education to members. | NJ | 226033161 |
| Steamfitters Local #475 | Related tax-exempt org | Provides collective bargaining for members. | NJ | 221305230 |
| Steamfitters Local #475 Pension Fund | Related tax-exempt org | Provides pension benefits for members. | NJ | 226029738 |
| Steamfitters Local #475 Surety Fund | Related tax-exempt org | Provides annuity benefits for members. | NJ | 222351695 |
| A & a Industrial Piping INC | Related taxable corporation/trust | — | — | — |
| AAA Refrigeration Service INC | Related taxable corporation/trust | — | — | — |
| Advanced Mechanical Corp | Related taxable corporation/trust | — | — | — |
| AMCO Enterprises INC | Related taxable corporation/trust | — | — | — |
| Armistead Mechanical INC | Related taxable corporation/trust | — | — | — |
| Benmar AIR Conditioning LLC | Related taxable corporation/trust | — | — | — |
| Binsky & Snyder INC | Related taxable corporation/trust | — | — | — |
| Buist INC | Related taxable corporation/trust | — | — | — |
| Centralpack Engineering Corporation | Related taxable corporation/trust | — | — | — |
| Desesa Engineering CO INC | Related taxable corporation/trust | — | — | — |
| EII INC | Related taxable corporation/trust | — | — | — |
| Environmental Climate Control INC | Related taxable corporation/trust | — | — | — |
| F & G Heating Mechanical Corp | Related taxable corporation/trust | — | — | — |
| FM Sylvan INC | Related taxable corporation/trust | — | — | — |
| Folgore Mobile Welding INC | Related taxable corporation/trust | — | — | — |
| Framan Mechanical | Related taxable corporation/trust | — | — | — |
| Furino & SONS INC | Related taxable corporation/trust | — | — | — |
| H T Lyons INC | Related taxable corporation/trust | — | — | — |
| Hammond Contracting CO | Related taxable corporation/trust | — | — | — |
| Industrial Fiberglass Services | Related taxable corporation/trust | — | — | — |