Seamless Steel Gas Cylinder Outer Dia(MM):from 140 Water Capacity (L):4 working pressure:15Mpa(150Bar) The seamless steel gas cylinder are all made of high quality steel, and are supposed to be used repeatedly for keeping permanent gases, such as oxygen, hydrogen, argon, krypton, nitrogen; and high-pressure liquefied gases, such as carbon dioxide ethylene.They are be used in industry, agriculture ...