The Frigidaire 5303918634 Refrigerator Defrost Thermostat Kit is a replacement item made particularly for Frigidaire refrigerators. This kit includes a defrost thermostat, which is an essential component in the automatic defrost cycle. The defrost thermostat detects the temperature inside the freezer compartment. https://www.hnkparts.com/5303918634-frigidaire-thermostat-kit