Quick twist copper connector The Fast Screw Fittings Is Made Of Brass And Other Materials. Nickel Plated On The Surface.For Quick Connection In The Pipeline,Generally One End Is An External Threaded Joint,The Other End Is Clamped And Connected With The Plastic Hose.Please Pay Attention To The Size Of The External Thread, The Inner Diameter And Outer Diameter Of The Connected HoseFast Screw Fittings Have The Characteristics Of Fast Installation, Convenient Installation, Reliable Sealing, Firm Connection, And Beautiful Appearance, And Have Been Used In All Walks Of Life..