Don't strain yourself slaving over a hand pump to inflate a tube, get yourself a Jetpilot Lightweight DC Air Pump. with a traditional 12V connection, stick it into the car or boat port, place it on the correct fitting (3 different sizes), and flick the on the switch, then watch and wait.

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• 12V Port Connection
• Multiple Valve Sizes
• 1psi Pressure
• 3 Metres of cord for easy inflation
• On/Off Switches