White-Rodgers 21D64-5PK HSI Refrigerant replacing this unit is the

replacing this unit is the standard corrective action

Symptoms may include a valve that fails to open or close properly

providing critical metering control to maintain optimal evaporator superheat

This robust weatherproof actuator cover is the standard choice for contractors looking to prevent premature equipment failure due to environmental exposure

allowing for motor replacement without draining the entire hydronic loop

White-Rodgers 21D64-5PK HSI Refrigerant replacing this unit is theWhen you're out on a service call dealing with a cracked silicon carbide igniter, the White Rodgers 21D64 5PK HotRod is the professional grade solution to keep on your truck. This 5 pack of 120V silicon nitride igniters is designed specifically for high efficiency gas furnaces, boilers, and water heaters. Unlike brittle carbide models, the nitride construction in this universal hot surface igniter handles the thermal stress of modern ignition cycles