... hardened durability 4.safe work form mechanis couplings ISO7241A series couplings features:1.Poppet valves available to prevent ... epuipment, forestry epuipment, agricultural machinery, oil tools, steel mill machinery, and other demanding hydraulic applicationscouplings MDirect ... valve2.machined from the material of carbon steel, brass, stainless steel,they are the solid bar to ensure ...