Product Material: safety control valve is made of high-quality material, which is strong and ; It not break during use, providing a tight, leak free connection Safe Use: when the heater is tilted or turned over, the dump switch automatically cut off the power and gas to prevent gas leakage; The principle of the thermocouple is that it can sense the flame and transmit the signal to the solenoid valve in the control valve; Dimensional Information: the dimensions of the control valve are: inlet Thread: female M101 (0.394inch), Outlet Thread: 7/16inch-24UNF Thread (0.429inch); Thermocouple wire is 350mm long overall with a temperature sleeve, Wide Application: heater Safety Kit Replacement Parts are suitable for low voltage repair control systems for grills, fire pits, fireplaces and heaters, compatible with most gas heaters