ZACUDA ABS One Way Air Valve Caps for Inflatables Boston Valve Replacement Kit —An excellent valve accessory for kayak with double leak-proof design. ❥❥Double Leak Proof The bottom of this Boston valve has a soft and durable rubber pad,which has good toughness, so that it can be tightly attached to the kayak, and together with the screw bonnet, it has a double leak-proof function. ❥❥Anti-slip Design The nut plug of this Boston valve has a vertical stripe design, which can increase friction to effectively prevent fingers from slipping valve cover is also a curved quadrilateral, which is fit the fingers,so that it can be more convenient to apply force. ❥❥Anti-lost Design The valve cover of this Boston valve is connected with the nut plug, which can effectively prevent the loss of the valve cover. And the connection is detachable,so that you can choose according to the specific situation. ❥❥Excellent Kayak Accessories This product set contains four Boston valves with screw air valve design. The characteristics of easy to install and replace,so that it is very suitable as a standard replacement part for Boston valves such as inflatable boats, rafts, and kayaks,which make It an excellent kayak accessory. ❥❥Practical Gift This is an excellent inflatable boat accessory so that it is a very practical gift choice for kayak fishing and kayaking lovers a practical gift can be impressive. ❦Specifications Material:Plastic Size: Thread Diameter 22mm Color:Black Weight: 140g ❦Packing Includes: 4*Boston Valve&4*Rubber Mat ◆Note: Please confirm the size before buying. Any problems you feel unsatisfied with your purchase, please feel free to contact us. We’ll try our best to make it right.