Nitrous Oxide, Helium Gas, Oxygen Gas manufacturer / supplier in China, offering High Purity Gas Cylinder 8L10L 40L 47L 50L Customized Packing DOT Standard, Industrial-Grade Seamless Cylinder 200 Bar, 50L, DOT/ISO Compliant, Suitable for Inert Gas and Non-Corrosive Media Storage, Pressure Vessel ISO/DOT-3al Aluminum Gas Cylinders Store for High Purity Gas, Calibration Gas, Electronic Grade Gas and so on.