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  • How To Make A PVC Water / Air / Vacuum Pump!

    This doesn't work. The outside diameter for schedule 40 (and schedule 80) PVC pipe is 1.315 inches: inside diameter of #219 O-rings is 1-5/16 (1.313) inches: the ID of the gasket is effectively the same as the outside diameter of the 1" plunger pipe, and the o-rings are not snug on the shaft before you even cut the grooves. When you cut the grooves as indicated, the O-rings are not even held tight to the shaft and are practically falling off. What gives? The 219 O-rings do not work and should be a smaller diamater. I wish I had done this research before I spent money ordering all the parts...

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