Nitrous Oxide, Helium Gas, Oxygen Gas manufacturer / supplier in China, offering Seamless Cylinders 40L, 50L, 80L (in Line With DOT/3AA, TPED, GB5099 Manufacturing Standards) Customized Gas Cylinder Racks, Industrial Oxygen Gas Cylinder Ideal for Welding, Cutting, and Metal Fabrication, 2L-20lhigh-Pressure Safety Gas Cylinder: Industrial-Grade Durable Storage Solution and so on.