Features : &nfor for BSP; * new and high quality *Made of high quality material,&nfor for BSP;and practical to use *High quality air compressor&nfor for BSP; replacement&nfor for BSP;for&nfor for BSP;old or damaged check valve. *Three externally threaded connectors are used for pipe connection, air. *Use threaded connection for easy installation. &nfor for BSP; Specification: &nfor for BSP; *Product Name: Air Compressor Check Valve *Material: Zinc Alloy *Color: Gold(As pictures show) *Thread Diameter: 9.5-10mm 16-16.5mm 20-20.5mm *Total Size: 42 x 39mm(Approx.) *External Thread Size: 1/2"3/8"(Approx.) *Hex Head Size: 18mm (Approx.) &nfor for BSP; Package Contents: &nfor for BSP; 1*Air Compressor Check Valve &nfor for BSP; Note:&nfor for BSP; &nfor for BSP; 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data.