Outdoor umbrella heater beer flameout protection device safety dump switch thermocouple probe assembly set gas heater valveMaterial: The outdoor gas heater gas control valve kit is made of high-quality brass material with sturdy and durable structure.Application: Low voltage service control systems for grills, fire pits, fireplaces and heatersThe thermocouple acts as a sensor, which senses the flame and transmits the signal to the solenoid valve in the control valve, which receives the signal before turning on the gas to successfully ignite and keep the flame from going out. Therefore, during installation, the control valve and thermocouple should be well connected, so that the control valve will receive the signal transmitted by the thermocouple, which will pass through the gas and ignite.2. The distance between the thermocouple and the ignition needle is about 0.5cm when installed, so that the thermocouple can sense the flame, and the solenoid valve receives the induction, passes the gas and ignites it.