USA Standard UN ISO 9809-1 43.3L welding gas cylinder

The steel 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 and Ethylene. They can be used in industry, agriculture, medical treatment, scientific research and analytical instruments, etc.