Using a Polyform Hand Pump #30 to inflate a Polyform Fender is simple. First, remove the plug. Second, insert the pump nozzle and inflate. Do not over inflate. It is better to under inflate. The fender wall should remain flexible. Finally, re-insert the plug. The plug face should be about flush with the surface, but not much more before it is snug. Do not over tighten. A properly inflated Polyform Fender should provide years of service if used as intended.