Open gas by correct size knob and push your valve around 5-10s till the thermocouple head is heated enough. Fix the thermocouple nut M8 on the valve end tightly (Check if your valve end thread if 8mm before you buy).

Bakelite knob OD: 38mm
Brand: Unbranded
Head thread size: M8*1
thermocouple: 600mm
Type: Barbecue & Grill Replacement Parts