Safety valve: high-quality flame failure protection for propane and LPG gas heaters with integrated thermocouple. This valve is used in low pressure systems. Connections: inlet and outlet with 1/4 inch left-hand thread for secure and reliable connections, the length of the thermocouple is 600 mm Operation: user-friendly rotary knob for precise control of gas flow and temperature. Thermocouple, knob and valve are used as a set, which is easier, easier and more convenient. CONSTRUCTION: Robust construction made from high-quality materials for long life and reliable operation. Compatibility: suitable for various propane and LPG gas heating systems with matching connections., Manufacturer: Meter Star