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A quick video showing my pneumatic golfball cannon, attached is a basic diagram of how the valve was created. There are several instructables that show similar construction.

http://i715.photobucket.com/albums/ww152/jor2daje/mypistonvalve.jpg?t=1248468706
<p>This is not spam, but a warning. PVC will fail suddenly after a while. This was band member that hurt badly by a T-Shirt launcher explosion.</p><p><a href="https://fundrazr.com/campaigns/1Zs3c" rel="nofollow">https://fundrazr.com/campaigns/1Zs3c</a><br>..</p>

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