... Use Method:1. Inspection: Connect the parts of the torch, put the gas pipe to connect the gas chuck, ... sure it tighten up, and close down the knob switch to the position of "−", then open the gas cartridge ... leakage in the trachea, and then hanging up the torch store in a cool ,well ventilated palce .Instructions:1 ... that the cock for the gas supply on the torch is firmly closed, The closing force of the ...