Steamfitters Local Union 420 has jurisdiction over all or parts of ten counties in southeastern Pennsylvania for the installation and service of mechanical systems. We service the entire state for gas pipeline distribution. In the area of instrumentation calibration, this "educational local" has jurisdiction over four Northeast states (PA, NJ, DE, NY). Members of the local are proud of their craft, proud of their city, and determined to do everything they can to insure the city and its surrounding suburbs will continue to grow and prosper. Throughout our great history, we've worked on many high profile projects in working to build Philadelphia into the great city it is today. We're proud to have worked on projects such as the Sun Oil Refineries, Children's Hospital of Philadelphia and the stadiums for the Eagles, Phillies, Flyers, and 76ers. If you're building new or upgrading your current industrial or commercial facility, build and service with Steamfitters Local 420 by utilizing one of our signatory contractors.