Boat Foot Pump Hose Adapter, H-r Valve Kayak Adapter Inflatable Boat Valves Hose Adapter Connector,2pcs it is recommended to inflate the board by hand until it is difficult to pump in, then use an adapter to inflate the pressure replacement accessory for all kinds of kayaks How to use: With the valve in the closed position, insert the American valve fitting nd rotate to lock in place Remove the cap on the connector and connect the standard electric pump Due to the time it takes to inflate the compressor/tire pump, it is recommended to inflate the board by hand until it is difficult to pump in, then use an adapter to inflate the pressure Specification: Weight: 9g/pc Product size: about 4.9cm long Color: black Package includes: 2pcs* screw-in air nozzle