Thanks for the info i use my 4500psi paintball air system regulated down to about 150psi for refills and i have a scuba tank to fill that.I dont have a compressor no room

Thanks... no its a 3/4 Quick Exhaust Valve works great!!! I know the valve is rated for 125psi has anyone pushed it passed that without any problems?

this is my second cannon i built. as you can see its just that (Hand Held Quick Exhaust Valve) with some assorted pipe fittings and an old 9 0z co2 paintball tank.

I have 2 barrels 1 is 1/2 inch x 44 copper pipe for AA batteries and a 3/4 x 30 for mini potatoe slugs