The original trigger for this high power PVC air cannon used a simple ball valve for the trigger. [Ben] didn’t like this solution – it was hard to open and somewhat unergonomic.

It's a perfect weekend project: With some PVC, batteries and switches, you can create a T-shirt gun like those used at sporting events. And if you're in New York on September 17, come to Maker ...

The original trigger for this high power PVC air cannon used a simple ball valve for the trigger. [Ben] didn’t like this solution – it was hard to open and somewhat unergonomic.

The heart of this gizmo is the valve at the bottom of the bucket and this is all you need to build one. I drilled holes in a 3” end cap and then cut a piece of inner tube rubber large enough to ...