1.Hydraulic quick coupling 2.Hydraulic quick coupler 3.brass,steel quick coupler 4.one year guarantee 5.Different thread Hydraulic Quick couplingHydraulic ... steel with Nickel plated, Zincplated, Copper plated. Our pneumatic quick coupler and plugs are available insteel, brass, and stainless steel, and ... or ferrules. Hydraulic male ,female Germany,USA ,ISO style Quick coupler