uxcell 21mm 16mm Male Threaded Air Compressor Check Valve Gold Tone Product Name : Air Compressor Check Valve;Color : Gold Tone Male Thread Diameter : 16mm / 1/4PT21mm / 1/2PT;Female Thread Diameter : 9mm / 1/8PT Hex Head Size : 20mm / 0.79";Total Size : 42 x 38 x 29mm / 1.7" x 1.5" x 1.1" (L*W*T) Material : Cast Metal;Weight : 70g Package : 1 x Air Compressor Check Valve