The Norcold 637360 Refrigerator Temperature Monitor Control Kit is a direct replacement for select Norcold refrigerator units. The temperature monitor control is used to detect improper operation of the cooling unit by monitoring the surface temperature of the boiler. In the event an abnormally high temperature is detected, all heat source outputs to the cooling unit will be disabled.• Compatible with Norcold 2118 / 1210 Series Refrigerators• Dimensions: 3-3/8"L x 3"W x 1-3/8"H• Thermocouple Wire: 23"