TOOGOO(R) 0.35" Female Thread Tube Connector Brass Check Valve for Air Compressor Product Name : Air Compressor Check Valve;Color : Gold Tone Male Thread Diameter: 16mm / 0.63";21mm / 0.83" : 21mm / 0.83" Female Thread Diameter : 9mm / 0.35";Hex Head Size : 18mm / 0.7" Total Size : 42 x 39 x 31mm / 1.65" x 1.54" x 1.22" (L*W*T);Material : Brass Weight : 60.3g;Package : 1 x Air Compressor Check Valve