Model number: ho07 brass check valve, brass spring check valve, brass checking valve, brass non-return valve, plumbing valves, water valves, hydraulic valvessurface: nature color. Size: 1/2''-4''material: c37700, ms58(cuzn40pb2), cuzn39pb3, cw602nthread endsconnection thread: npt, bsp, bspt working pressure: 16bar-20barworking media: water, steam, oil etcforging brass body and cap, stainless steel spring, plastic disc.