Taco SR502-4 2 Zone Switching Relay with Priority
The two zone switching relay should be standard equipment for every installer. No matter what type of job, our single zone switching relay replaces every brand made by every manufacturer. The two zone switching relays are compatible with conventional and programmable thermostats, UL listed and come with a 3 year warranty. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.