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9 Kg Nitrogen N2 Hydrogen H2 Oxygen O2 Diameter 140mm Thickness 3.6mm Gas Cylinders with Valve, Find Details and Price about Industrial Gases Nitrogen N2 from 9 Kg Nitrogen N2 Hydrogen H2 Oxygen O2 Diameter 140mm Thickness 3.6mm Gas Cylinders with Valve - Chengdu Hongjin Chemical Co., Ltd.