Feature 1Comes in three parts: one inside part, one outside part and valve cap. 2Will fit most inflatable boats, river rafts and kayaks. 3Easy to inflate and to deflate. 4Double seal leak protection. Excellent air leakage performance. 5Great accessory for boating enthusiasts.Specification Features: Comes in three parts: one inside part, one outside part and valve cap. Will 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: Condition: 100% Brand New and High Quality Material: PVC Color: Gray Upper Outer Diameter: Approx. 6.5cm/2.5'' Lower Outer Diameter: Approx. 4.2cm/1.6'' Height: Approx. 5cm Weight: Approx. 85g How to use:Method 1: Inflate the air when the spring in the middle of the valve does not pop out (only inhale but not out)Advantages: After the air is full, pull out the inflation tube, the air nozzle shrapnel will automatically close, and there will be no air leakageDisadvantages: slow inflation speed, long time, abnormal noise may occur due to gas pushing the shrapnelMethod 2: Rotate the operating lever in the middle of the gas nozzle, and the other shrapnel is fully opened (inlet and out)Advantages: fast inflation speed, short time, no abnormal noiseDisadvantages: After being fully charged, when the inflation tube is pulled out, a part of the air will leak because the air nozzle is in a fully opened state, until the operating lever in the middle of the manually rotating air nozzle is closedEither way, after the air is full, the air nozzle cap and air nozzle must be screwed tightly to prevent air leakage Packing List: 1 x Boat Air Valve Note: After inflating, you should tighten the valve and valve cap, in case of air leakage. .