The Supco TH181975 Thermocouple 39 in is a replacement temperature-sensing component designed for compatible heating and gas appliance applications. It detects temperature and provides a signal to the control system to support proper heating operation. With a 39-inch length, this thermocouple is designed for convenient installation where the original component requires replacement. It... https://www.hnkparts.com/th181975-thermocouple-39in-sea