Features:1. This boat air valve comes in three parts: one inside part, one outside part, and a valve cap2. marine air valve is fit most inflatable boats, river rafts and kayaks3. Air plugs PVC air gas valve is easy to inflate and to deflate; After inflating, you should tighten the valve and valve cap, in case of air leakage4. Kayak raft plug replacement has double seal leak protection. Excellent air leakage performance5. Boat valve replacement is a great accessory for boating enthusiasts Specifications:Condition: 100% Brand New and High QualityMaterial: PVCColor: GrayUpper Outer Diameter: 6.5cm/2.5''Lower Outer Diameter: 4.2cm/1.6''Height: 5cmWeight: 85g Packing List:1 x Boat Air Valve 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