[Quality Material] This kayak air valve is made of environmentally friendly, high-quality material, which is waterproof and wear-resistant. [Double Seal] This boat air valve features a core and cover with sealing rubber rings. The double sealing design helps prevent air leakage. Please check if the size of your kayak valve is compatible with this plug before purchasing. [Two Methods] This boat valve supports two inflation methods. One method is inflating when the spring in the middle of the valve is not extended (air enters but does not escape). The other method involves rotating the operating lever in the middle of the valve to fully open it (allows airflow in and out). Regardless of the method used, always tighten the air nozzle cover and air nozzle after inflation to help prevent air leakage. [Application] This air valve replacement consists of three parts: inner part, outer part, and valve cover. The upper outer diameter is approximately 2.5 inches (6.5 cm), and the lower outer diameter is approximately 1.6 inches (4.2 cm), suitable for most inflatable boats, river rafts, and kayaks. Features: Includes one inside part, one outside part, and one valve cap. Fits most inflatable boats, river rafts, and kayaks. Easy to inflate and deflate. Double seal helps protect against leaks. Provides reliable air retention performance. A great accessory for boating enthusiasts. Specifications: Upper Outer Diameter: 6.5 cm / 2.5 inches Lower Outer Diameter: 4.2 cm / 1.6 inches Height: 5 cm How to Use: Method 1: Inflate when the spring in the middle of the valve is not extended (air enters but does not escape). Advantages: After inflation, remove the inflation tubethe valve automatically closes with no air leakage. Disadvantages: Slower inflation speed, longer inflation time, may produce noise due to gas pressure. Method 2: Rotate the operating lever in the middle of the valve to fully open it (allows airflow in and out). Advantages: Faster inflation speed, shorter time, no abnormal noise. Disadvantages: After inflation, when the inflation tube is removed, some air may escape since the valve remains open until the operating lever is manually rotated to close it. In both cases, after inflation, ensure the air nozzle cap and air nozzle are securely tightened to help prevent air leakage. Color: Gray Material: Plastic Package Contents: 2 x Air Valve Note: Light reflection and differences in display screens may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 13 cm.