... 1. Material of stainless steel reducing tee pipe fitting, ss grooved tee pipe fitting, ss tee fitting:Stainless steel, such as SS303, ... etc.2. Seal materials of stainless steel reducing tee pipe fitting, ss grooved tee pipe fitting, ss tee fitting:Seal material ... /1101.6Gas,fule,oil3. Essential technology of stailess steelStainless steel prevetion and corrosion, gas protection, excluding temper color, ...