Taco Switching Relay SR501-4 HVAC Relay For Zoning With Circulators Boxed Green Condition: New Features: Switching relay for zoning with circulators; external indicator lights; fuse protected outputs; simplified wiring for easy installation Material: Electronic relay components (packaged) Color: Green (relay shown on box) Perfect for: HVAC zoning systems, residential or commercial installers and contractors See photos for close-up of condition and accurate sizes.
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