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The 572-3 from Taco is a 1” Sweat 570 Zone Valve. It offers a convenient way to create individual zones in radiant heating or hydronic heating system. Using a single circulator pump with multiple zone valves makes it possible to start/stop the flow and divert it to achieve individual room or area comfort control and energy savings. Taco Zone Valves are the industry standard for heating applications. The manual open lever and twist off head make installation and service easy.