All brass body. Working Pressure:15Mp. Safety Device: Standard. Safeguard :18-22.5Mpa... If ... more info,pls contact:ethanvuv Detailed Product Description:Working Pressure: 15MpaNominal Diameter: 4 mm....Medium: O2,N2,AIR,CO2Outlet ... of valves for various gas cylinders. It mainly produces gas cylinder valves, gas pipe valves, industrial gas decompressors, civil liquid gas boosters, brass ball valves ...