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Plumbers Pipefitters Local Union 4 Plumbers Pipefitters Local Union 4 Welcome to Plumbers Pipefitters Local Union 4 150 Hartwell Street West Boylston MA 01583 Ph. 5088351150 Welcome to Plumbers Pipefitters Local Union 4 150 Hartwell Street West Boylston MA 01583 Ph. 5088351150 About Us Plumbers Pipefitters Local 4 was chartered by the United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canadaon February 7 1890. Local 4 represents licensed plumbers pipefitters and HVAC techniciansin the Worcester MA County area.