How to Pump up Plastimo Fenders

The Plastimo fenders have a screw-in stooper (and not a proper valve) that has a slot right across it. When you unscrew it to inflate you can't get a good seal and then when you take the pump off it goes down before you can screw the stopper in again. Hence the special adapter which is shaped to fit in so you can screw it in whilst maintaining the seal. Blooming stupid system.
 
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