Features:1) Uni-directional shut off coupler with an automatic shut off valve built in the socket, recommended for piping of compressed air connections2) Bi-directional shut off coupler with an automatic shut off valve built-in the socket and plug, recommended for piping of chemicals, steam and oil3) Double shut off couplings are used extensively when it is important to minimize fluid loss upon disconnections4) Both valves of coupler, the body and nipple, contain shut off valves, these valves open automatically when the body and nipple are connected, and close automatically when two valves are disconnected, keeping fluid loss to the minimumSPE Other Price Terms: FOB, CIF, CFR Payment Terms: T/T, L/CSupply Ability: 50,000pcs/day