Flame failure valve with inlet and outlet with Flare thread 5/8-18UNF Only suitable for Low pressure application (max BTU rating: 50000) Suitable for Gas grill, heater, fire pit, fireplace if same connections Specifications: 600mm thermocouple with M8*1 threaded Bakelite knob OD 38mm, D shaft 6.1mm Operation Instructions 1. Fix the valve on a plate or board of your grill or fire pit by the screw and flange. 2. Connect your inlet and outlet hose on inlet and outlet side. (fix it tightly enough in case of gas leakage) 3. Fix the thermocouple nut M8 on the valve end tightly (Check if your valve end thread if 8mm before you buy) 4. Connect thermocouple and end thread well 5. Open gas by correct size knob and push your valve around 5-10s till the thermocouple is heated enough. 6. Release your hand and it work properly If when you release hand, gas valve shut off again, please check If your thermocouple is always be heated on flame If the thermocouple end is well connected with valve If the