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12.2.4.1  Cutting and flaring the piping 
1  Please cut using pipe cutter and then remove the burrs. 
2  Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end 
down to avoid the metal powder entering the pipe. 
3  Please make flare after inserting the flare nut onto the copper pipes.