3 Zone Expandable Switching Relay w/ Priority

SKU: SR503-EXP-4
Regular price $189.59 USD

The Taco Switching Relay is the best choice for all your zoning needs, with advanced timer and boiler functions, external diagnostic lights, switchable priority and contracctor friendly PC board layouts. Combined with the time proven reliability of the 00® family of circulators and thermostats, total system integration is achieved.