Refrigerator Defrost Heater and Thermostat (part number WR51X442) is a Genuine GE replacement part. For more than 100 years, GE Appliances has been a trusted brand, synonymous with quality and reliability. To continue earning your trust, our appliances and parts are engineered to precise specifications and subjected to rigorous testing. Behind every GE Appliances product is the work of thousands of dedicated Americans committed to excellence as well as a better future for our communities and our environment.