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Greater Boston Plumbing Contractors Association GBPCA Protecting the Health of the Community Since 1883 The Greater Boston Plumbing Contractors Association is a trade association representing the regions premier unionized plumbing contractors and advancing the plumbing industry alongside our highly trained and talented labor partners the Plumbers and Gasfitters Local 12. Learn More Featured Projects The PCA was proud to gather over 450 union contractors plumbers and guests for Industry Appreciation Night 2023 to celebrate The Power of Partnership and raise funds for college scholarships benefiting the children of union plumbers and PCA contractors employees. Valante Mechanical worked on the new Bruins and the Celtics training facilities at Boston Landing. J.