[RyanN]

To emphasize my point about no PVC... earlier this week, one of the kids at school was making a potato launcher and charged it to 45PSI when it exploded right in his face. Luckily he was not hurt by the explosion. It failed not in the PVC pipe, but the thick joints. This goes to show even though many think thicker is better, it is not always the case.

This was the tank that was used on our t-shirt shooter before we converted to a real tank.

So again, please DO NOT USE PVC. People can be seriously wounded, or even killed (as evident by the hole in the roof).

Also, I was not there when it happened, so I had no control over it. What appeared to happen was a crack rapidly developed in the joint, the glue failed, and then it shot the tank off like a rocket.