[Quality Material]: This kayak air valve is made of environmentally friendly material, which is waterproof, wear- and [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 out; The other is to rotate the operating lever in the middle of the valve to make the fully open, no matter which method, 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, outer 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 kayak Features: Comes in three parts: one inside part, one outside part and valve cap. fit most inflatable boats, river rafts and kayaks. Easy to inflate and to 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 out (only inhale but not out) Advantages: After the air is full, pull out the inflation tube, the air nozzle automatically close, and there be no air leakage Disadvantages: slow inflation speed, long time, abnormal noise may occur due to gas pushing the Method 2: Rotate the operating lever in the middle of the gas nozzle, and the other is fully opened (inlet and out) Advantages: fast inflation speed, short time, no abnormal noise Disadvantages: After being fully , when the inflation tube is pulled out, a part of the