I know the HPA tank is over kill but I got it for free so would like to use it.

The challenge for me is going to be finding the fittings, anyone got any suggestions what kind of supplier might carry them?

Thanks for your reply, but seriously all I'm going to build is just a simple spud gun using a tennis ball or smaller pvc capsule loaded with BBs or sand attached to a the line of a fishing spinning reel mounted on the barrel. I can make the entire gun out of PVC but would like to use the HPA tank I ...

I want to build an air cannon that will fire a tennis ball out of a pvc pipe. The purpose of this Launcher is so I can shoot a string over tree limbs then use the sting to pull up a rope, then use the rope install Wire Antennas in Trees. I have a HPA tank and I would like to remove the PIN fill valv...