The Taco Switching Relay is the best choice for all your zoing needs, with advanced timer and boiler functions, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00® family of circulators and thermostats, total system integration is achieved. Additional features include built-in priority protection, preium sealed relays, compact design, fuse protected, isolated end switch and universal thermostat compatibility.

The 550 Series is designed for high-head capacity applications such as high-rise residential and commercial buildings. Heavy-duty construction enables this series to operate up to 150 feet of pump head. Available in 1/2" - 1" sweat connections.