Great replacement for the old or broken check valve of your air compressor.Easy to install with the thread connecting ends.The two male thread one female thread connectors are respectively for tube connecting, air pressure tank and compressor piston pump. Specification:Product Name: Air Compressor Check ValveColor: GoldenMaterial: BrassMale Thread Size: 1/2G 3/8GFemale Thread Diameter: 1/8GTotal Size: 44.6 x 35.4 x 28.6mm / 1.76 x 1.39 x 1.13 inch(L*W*H) Package Content: 1 x Air Compressor Check Valve