| Steamfitters Local Union #475 Welfare Fund | Related tax-exempt org | Provide health benefits to members | NJ | 221516999 |
| Steamfitters Local Union #475 Education Fund | Related tax-exempt org | Provide training and education for members | NJ | 226033161 |
| Steamfitters Local Union #475 | Related tax-exempt org | Provide collective bargaining for members | NJ | 221305230 |
| Steamfitters Local Union #475 Pension Fund | Related tax-exempt org | Provide pension benefits for members | NJ | 226029738 |
| Steamfitters Local Union #475 Surety Fund | Related tax-exempt org | Provide annuity benefits for members | NJ | 222351695 |
| Armistead Mechanical INC | Related taxable corporation/trust | — | — | — |
| A & a Industrial Piping INC | Related taxable corporation/trust | — | — | — |
| AMCO Enterprises INC | Related taxable corporation/trust | — | — | — |
| Advanced Mechanical Corp | Related taxable corporation/trust | — | — | — |
| AAA Refrigeration Service INC | Related taxable corporation/trust | — | — | — |
| A & a Industrial Piping INC | Related taxable corporation/trust | — | — | — |
| Buist INC | Related taxable corporation/trust | — | — | — |
| Benmar AIR Conditioning LLC | Related taxable corporation/trust | — | — | — |
| The Barham Group LLC | Related taxable corporation/trust | — | — | — |
| Bowen Engineering Corporation | Related taxable corporation/trust | — | — | — |
| Bennett Brothers Mechanical INC | Related taxable corporation/trust | — | — | — |
| Centralpack Engineering Corporation | Related taxable corporation/trust | — | — | — |
| Desesa Engineering CO INC | Related taxable corporation/trust | — | — | — |
| DU MONT Mechanical | Related taxable corporation/trust | — | — | — |
| EII INC | Related taxable corporation/trust | — | — | — |
| Excel Construction & Design | Related taxable corporation/trust | — | — | — |
| Environmental Climate Control INC | Related taxable corporation/trust | — | — | — |
| EPIC Mechanical INC | Related taxable corporation/trust | — | — | — |
| Furino & SONS INC | Related taxable corporation/trust | — | — | — |
| Folgore Mobile Welding INC | Related taxable corporation/trust | — | — | — |