Low max operating pressure 1/2 psi (65 mbar), main inlet and outlet control valve with 3/8" male thread Thermocoupler length 600mm M8 x 1 spigot ( this is a low pressure control valve max BTU 50,000) Black bakelite plastic knob diameter 38 mm and insert "D" for valve 6.0-6.1 mm Suitable for low pressure repair control system for grill, fire pit, fireplace and heater (max BTU rating: 50,000 operating pressure 65 mbar) Keep the thermocoupler heating and push the valve around 5-10 seconds, then release the hand (if the flame goes out, adjust the location of the thermocouple tip) Product The valve is a low pressure valve with 3/8" male thread on the inlet and outlet. Instructions for use: 1) Fix the valve on a plate or panel of your barbecue or fire pit using the cap screw and flange. 2) Connect your inlet and outlet hose to the inlet and outlet side. (faston tightly enough in case of gas leakage). 3) Fasten the M8 thermocouple nut tightly on the valve end (check if your valve end thread if 8mm before d 'buy). 4) Connect the thermocouple and end thread well. 5) Open the gas with the correct size knob and push your valve around 5 to 10 seconds until the thermocouple head is heated enough. 6) Release your hand and it works fine. If you release your hand, the gas valve will turn off again, please check a. If your thermocouple is still heated over the flame. b. If the end of the thermocouple is well connected to the valve. c. Whether the inlet and outlet side connect well with the pipe you have. Possible problems during your use: 1) The valve after one turn cannot stick during use. Reason: a. The thermocouple head is not heated in the right place, please adjust the position of the thermocouple tip. b. The connection between the thermocouple end and the valve is not tight enough or too tight. Please adjust the screw again. c. You need to push the valve first, then turn the pin and hold for a few seconds, it can't stick immediately for 10-30 seconds