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Simply... the valve is a one way valve that lets in air one way but does not let air out. It it basically a hole with a flap on the inside. The flap closes when pressure is pushing out but opens when pressure is pushing in.. like when you put in the pump nozzle.

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โˆ™ 2005-11-30 15:38:41
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Q: How does a basketball air valve hold in the air?
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