Specifications: Condition: Brand New 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 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 leakage Disadvantages: slow inflation speed, long time, abnormal noise may occur due to gas pushing the shrapnel Method 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 noise Disadvantages: 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 closed Either way, after the air is full, the air nozzle and air nozzle must be screwed tightly to prevent air leakage Packing List: 2 x Boat Air Valve Note: After inflating, you should tighten the valve and valve, in case of air leakage.