Instead of using a ball valve or other such contrivance to dump air directly from a reservoir into the chamber of this PVC air cannon, [Ben] is using a much more clever design. This is a barrel ...

The build uses PVC pipes for both the barrel and the air tank ... with the twin-reservoir design also acting as a useful shoulder mount. Charging the cannon is done via a Schrader valve, as ...

I turn a pile of pipes and a grill igniter into a powerful makeshift carrot cannon! Using various fittings and adhesives, I design a chamber for explosions with a three-way fitting as the barrel ...