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50L Seamless Steel Nitrogen Oxygen Lar CNG Acetylene CO2 Hydrogeen CNG 150bar/200bar High Pressure Gas Cylinder, Find Details and Price about Nitrogen Cylinder Cylinder from 50L Seamless Steel Nitrogen Oxygen Lar CNG Acetylene CO2 Hydrogeen CNG 150bar/200bar High Pressure Gas Cylinder - Hangzhou ChengYingYi Energy Technology Co., Ltd.