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Turn an ordinary bicycle pump into an air powered piston to make your Halloween decorations more interactive! You can use this device to make your decorations jump out ...
Start a fire with airby watermelon
How To Make A PVC Water / Air / Vacuum Pump!by The King of Random
Make a Fire Piston!by rickosgood
Microgrid! The backyard pneumatic grid projectby gaiatechnician
Make a BB gun from a Flashlight! (700fps!)by MrCrowley
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