Nitrous Oxide, Helium Gas, Oxygen Gas manufacturer / supplier in China, offering Empty Fire Fighting CO2 Gas Cylinder, High Pressure 150bar, 200 Bar, 300bar, Wholesale High Quality Fire Extinguisher Cylinder Powder Fire Extinguisher 1kg 3kg 6kg 12kg, 10kg Refrigerant Gas R507A (HFC Refrigerant) Purity99.93% 22lb/10kg, 25lb/11.3kg 400L, 800L, 926L and so on.