Check Valve Material: The air compressor control valve is made of brass filled, with compression resistance, high performance and high reliability, without much maintenance Easy to Install: Convenient to install with the thread connecting ends. The 3-male thread connectors are respectively for tube connecting. Check compatibility and dimensions before purchasing Tips: This compressor check valve 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 Function: The air compressor check valve is used in the fluid system to prevent reverse flow fluid, or used in the pneumatic system to prevent the reverse flow of compressed air Good Replacement: This check valve is a excellent replacement for the old or broken check valve of your air compressor. Thread Diameter: 9.5-10mm 16-16.5mm 20-20.5mm, Manufacturer: Nikou