Thanks to the clear thread, you can install the air compressor non-return valve quickly and easily. This check valve prevents air in the tank from flowing back to the compressor and features three male threaded connectors for connection to the pipe, pressure tank, and compressor piston pump. Style 1 is made of copper and style 2 is made of zinc alloy, both designed for durability. The check valve measures 5cm in length, 3.5cm in width, and 3.5cm in height. The thread diameters are 10mm, 14mm, and 16mm respectively. It serves as a suitable replacement for a damaged or worn air compressor check valve. Item Name: Air Compressor Check Valve Material: Copper, Zinc Alloy Color: Golden Specifications: 1: Copper, 2: Zinc Alloy Features: Easy Installation, Clear Thread, Long Service Life Size 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 differences in lighting and screen settings, the item's color may vary slightly from the images. Please allow slight variation in measurements due to manual measurement. Package Includes: 1 x Air Compressor Check Valve