[NightHawkInLight] a.k.a. [Ben] recently built an awesome high power air cannon out of PVC pipe. PVC air cannons ... Instead of using a ball valve or other such contrivance to dump air directly ...

For PVC pipe ideas, this is a home run. With the downloadable plan from The Tinker Shop, and about $15 in materials, you can ...

But not [truebassB], instead he built his own air pump from first principles (YouTube, embedded below) using PVC pipe. It’s a straightforward ... A couple of ball check valves are used for ...