Plumbers & Gasfitters Local 12 Boston was chartered on February 7, 1890 by the United Association of Journeymen and Apprentices of the Plumbing, Pipefitting, and Sprinkler Fitting Industry of the United States and Canada, Plumbers and Gasfitters Local 12 has been aggressive with defending the integrity of the plumbing industry. We have also made it our goal to insure that hard working plumbers have job protection and top wages on public projects in the Commonwealth.