[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 core and cover both have sealing rubber rings. Double sealing can effectively prevent air leakage. Please check if the size of your kayak valve fits this plug before buying. [Two Methods]: This boat valve has two inflating methods. One is to inflate when the spring in the middle of the valve does not extend out. The other is to rotate the operating lever in the middle of the valve to fully open it. No matter which method is used, be sure to tighten the air nozzle cover and air nozzle to prevent air leakage after the air chamber is full. [Application]: This air gas valve replacement is divided into three parts: inner part, outer part, and valve cover. Its upper outer diameter is about 2.5 inches, and the lower outer diameter is about 1.6 inches, which is suitable for most inflatable boats, river rafts, and kayaks. [Features]: Comes in three parts: one inside part, one outside part, and valve cap. Fits most inflatable boats, river rafts, and kayaks. Easy to inflate and deflate. Double seal leak protection. Excellent air leakage performance. Great accessory for boating enthusiasts. [Specifications]: Upper Outer Diameter: 6.5cm / 2.5 inch. Lower Outer Diameter: 4.2cm / 1.6 inch. Height: 5cm. [How to Use]: Method 1: Inflate the air when the spring in the middle of the valve does not extend out (air intake only, no outflow). Advantages: After inflation, remove the inflation tube; the air nozzle automatically closes with no air leakage. Disadvantages: Slow inflation speed, longer time required, and possible abnormal noise due to gas pressure on the valve. Method 2: Rotate the operating lever in the middle of the air nozzle to fully open it (allows both inlet and outlet). Advantages: Fast inflation speed, short time, no abnormal noise. Disadvantages: After inflation, when the inflation tube is removed, some air may escape because the nozzle remains fully open until the operating lever is manually rotated to close it. In both methods, after inflation is complete, the air nozzle cap and air nozzle must be securely tightened to prevent air leakage. Color: Gray Material: Plastic Package Contents: 2 x Air Mattress Valves Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement allowance is +/- 1-3cm.