Okay guys, thanks again for all of the valuable information. I finally got all of the parts and I have started to assemble. I am about to glue the chamber and will be going with 175 ci, 3000 ml, do you think this is a good size? Speak now or forever hold your peace! http://i297.photobucket.com/album...

Thanks for suggesting that program, it really helped! I'm going with 175 ci, 3000 ml.

About the DWV end cap.. I have a Lowes, Home Depot, and Menards near me and I am still having trouble finding the PVC fittings I want. Any recommendations on where to find PVC, brick and mortar or online?

Okay thanks guys. I am going to add a T of the second ball valve with a secondary pressure gauge. Now I just need to figure out how big to make the chamber. I want the C:B to be at least .9 with a 1.5" X 72" spud barrel. That would give me a chamber volume of 125 ci. I will have a golf ball barrel, ...

I am going to build a advanced spud gun. I will be using metered propane. Most guns I see on here have a psi gauge built into the regulator (i.e husky regulator), but then they throw on a extra gauge on the meter pipe. If you already know the psi post regulator, why waste the money for a gauge on th...