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REPRESENTING ONTARIO’S UNIONIZED PLUMBERS, STEAMFITTERS, WELDERS, SPRINKLERFITTERS AND REFRIGERATION TECHNICIANS The Ontario Pipe Trades Council (OPTC) of the United Association of Journeymen and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada represents 10 Local Unions in the Province of Ontario. These Local Unions have a strong membership of over 22,000 […]