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Before inflation, use a small tool to withstand the inflation core, and completely discharge the residual gas inside, so that the pressure in the lighter gas tank is eliminated. Press the outlet of the gas tank vertically downward, and press for about 5 seconds each time, two or three times. Please wait for about 5 minutes after filling, if there is still no fire after 5 minutes, please adjust the valve larger. (Note the +- direction)..syi