Thanks to the clear thread, you can install the air compressor non-return valve fast and effortlessly.Preventing the air in the tank from returning to the compressor, this check valve can have 3 male threaded connectors for pipe connection, the pressure tank and the compressor piston pump respectively.Style 1 is made of copper and the style 2 is made of zinc alloy, both of them are durable to use.The check valve is 5cm long, 3.5cm wide and 3.5cm high. 3 thread connector's diameters are 10mm, 14mm, 16mm respectively.It is a perfect replacement for the old or broken check valve of your air compressor.Item Name: Air Compressor Check ValveMaterial: Copper,Zinc AlloyColor: Golden Specifications: 1: Copper, 2: Zinc AlloyFeatures: Easy Installation, Clear Thread, Long Service LifeSize Details: Check Valve Size: 5cm x 3.5cm x 3.5cm/1.97" x 1.38" x 1.38" (Approx.)Thread Diameter: 10mm/0.39", 14mm/0.55", 16mm/0.63" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Air Compressor Check Valve