Made of copper and rubber material, durable and easy to use. Professional designed for boat and kayak use. Leakproof and easy to use, unique portable small size design makes it free to use. Strong sealing, anti-leakage, makes you use it more easily. Feature - Color: Black. - Material: Rubber and copper. - Size: 7.80X3.40X3.40cm/3.07X1.34X1.34 inch. - Strong sealing, anti-leakage, durable, let you use it more easily. - SUP electric pump adaptor utilizes a standard Schrader fitting to couple with an air compressor or bike, tire pump. - With the in the closed position, insert the Schrader fitting and rotate to lock in place. Remove the on the fitting, and connect to a standard electric pump. - The air adapter Fit for inflatable boat, kayak, paddle sup board, etc. - Can be used with car air pumps and conventional tire air pumps.