Installation instructions do NOT accompany this part! This Defrost Bi-Metal Thermostat protects the evaporator from overheating during the defrost cycle in the following Samsung refrigerators: RF4267HARS, RF4267HARS/XAA, RF263AEWP, RF263AEWP/XAA, RF217ABBP, RF217ABBP/XAA This item is NEW and a true Samsung part! If you don't see your model number -- Please send us a message so we can help you to select the correct bin. We are happy to help!