Pennsylvania plumbers working from the 1940s through the 1980s regularly handled asbestos-containing pipe insulation, gaskets, and packing materials at refineries, steel mills, power plants, and commercial buildings throughout the state.

Union locals: UA Local 690 (Philadelphia) · UA Local 27 (Pittsburgh) · UA Local 420 (Northeast PA) · UA Local 520 (Reading/Berks County)

Asbestos gaskets, rope packing, and pipe wrap were standard materials in plumbing work through the late 1970s. Workers cutting or disturbing these materials released respirable fibers.