With the valve in the closed position, insert the Schrader valve fitting and rotate to lock in place. Remove the cap on the fitting, and connect a standard electric pump.Because the compressors/tire pumps take time to inflate, it is recommended to inflate the board by hand until it becomes difficult to pump, and then use the adaptor to top off the pressure. This inflatable SUP valve adapter has easy conversion, and the efficiency of its inflation is quite high.Use your compressor or tire pump to easily reach suggested PSI within 5-10min. Adopt fine workmanship and delicate design, convenient to use. Lightweight and portable, individual sealed package, easy to use and carry. Features: 1. Made of strong plastic and alloy, high pressure resistant and durable to use. 2. Lightweight and portable, easy conversion, quick inflation. 3. Application: SUP paddle board, assault boat, dinghy. Material: Copper + rubber Size: 3.4 x 7.8cm Package Included: 1 x Air Valve Adaptor