Features: 1.The safety thermocouple sensor is a new gas stove water heater thermocouple aftermarket replacement part, designed to directly replace part number Q340A1090 for 30 millivolt systems. This product is not the original product of the brand, but the quality of the product still meets the OEM standard, please rest assured to repair your electrical appliances. 2.The safety thermocouple sensor generates voltage to open the seal by activating the electromagnet in the safety valve. Used for gas valve pilot safety control devices in furnaces, boilers, water heaters, and room heaters. .