1.Quick release air coupling 2.Hydraulic quick coupler 3.brass,steel quick coupler 4.one year ... : Brass, Carbon steel with Nickel plated, Zincplated, Copper plated. Our pneumatic quick coupler and plugs are available insteel, brass, and stainless ... hose barbs must be firmly fastened withhose clamps or ferrules. Pneumatic hydraulic male ,female Germany,USA ,ISO style Quick release air coupling ...