Norcold Cooling Unit 636411 (for N300/ N302/ N305/ N306 models) This is the Cooling Unit for Norcold N305 / N306 Model Refrigerators. Fits all: N300 N300.3 N302 N302.3 N305 N305.3 N306 N306.3 *Also note that this is a non-returnable part. MAKE SURE that the cooling unit is defective before ordering.