Features Product Name: Air compressor Check Valve Material: Brass filled Excellent replacement for the old or broken check valve of your air compressor. The three male thread connectors are respectively for tube connecting, air.Air compressor Convenient to install with the thread connecting ends.Air compressor Specifications: Product Name: Air compressor Check Valve Material: Brass filled Color: Golden Thread Diameter: 9.5-10mm 16-16.5mm 20-20.5mm Total Size: 42 x 39mm Male Thread Size: 1/2" 3/8" Hex Head Size: 18mm Tips:  This product is suitable for thread G1/2*3/8*10=20*16*10mm. For direct-line 2.5-3-4-5P small piston air pump and oil piston air compressor. Note: Please allow a little size error due to manual measurement. Package Included: 1 x Air Compressor Check Valve   Package List