This is an evaporator for refrigerators. The evaporator has refrigerant going through it, and when it turns from a liquid into a gas through evaporation, it cools the area around it. This is what provides the proper temperatures for the refrigerator to keep food from spoiling. If it's not working properly, it could mean that the refrigerator won't stay cool.The evaporator could be damaged if the refrigerator is dropped during a move, although it's rare. Over time, the evaporator could start to suffer from wear and tear.The evaporator will work on certain models of refrigerators from KitchenAid and Whirlpool. It is a genuine OEM replacement part, and it is sold individually.4388575 (AP3109086) replaces 1113042, 111306280002, 111306290021, 111306410011, 111306410014, 2001133, 2002966, 777407, AH372080, EA372080, PS372080, W10122129.