| PIPE Fitters' Retirement Fund Local 597 | Related tax-exempt org | Provides retirement benefits | IL | 626105084 |
| Pipefitters Association Local 597 401(k) | Related tax-exempt org | Provides retirement benefits | IL | 361820310 |
| Pipefitters Training Fund Local 597 | Related tax-exempt org | Provides training to participants | IL | 362536349 |
| Pipefitters Local 120 | Related tax-exempt org | Contributing employer | — | — |
| Pipefitters Local 274 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 9 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 23 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 25 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 101 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 172 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 189 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 190 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 286 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 295 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 322 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 344 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 357 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 393 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 430 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 520 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 524 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 525 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 553 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 562 | Related tax-exempt org | Contributing employer | — | — |
| Plumbers and Pipefitters Local Union 572 | Related tax-exempt org | Contributing employer | — | — |