1) M:Aluminum Alloy 2) DIA: 42-203mm 3) W.C: 0.15-14.3L 4) Working Pressure: 15MPA/20MPA 5) Testing Pressure:25MPA/30MPA Aluminum Alloy Gas Cylinders Product Description The Seamless Aluminum Alloy Gas Cylinder is made of superior quality aluminum alloy 6061 and manufactured through the procedures of punching, drawing, heat treatment, CNC flow forming spinning, anodic oxidation treatment to the ...