【Part Number】: WR51X442 defrost heater. 【Include】: defrost thermostat and 2 defrost heaters 【Function】: The defrost heater keeps the cooling coils from frosting over and the thermostat senses that the heat near the cooling coils has reached the desired temperature. Used with side by side models. 【Premium Quality】: The replacement part is made from high quality material for long lasting 【Promise】: Discount Parts Direct is a US based company, from molding, stamping to assembly, inspection of each process has strict quality requirements and hand check 【Part Number】: WR51X442 defrost heater. 【Include】: defrost thermostat and 2 defrost heaters. 【Function】: The defrost heater keeps the cooling coils from frosting over and the thermostat senses that the heat near the cooling coils has reached the desired temperature. Used with side by side models. 【Premium Quality】: The replacement part is made from high quality material for long lasting.