2'' air chamber

[mega_swordman]

I can't really tell you, but I can give you advice. First, if you want to use higher pressures, the best would be to go with a ball valve. Secondly, how much pressure do you want to go with? Aiming big is good, but it gets to the point where it is ridiculous. And lastly, we can give you an answer better with the thickness of the iron. The dimensions don't really matter because we can't tell how thick it is by the diameter (but we can guess.)

[roughboy]

Ok, so never mind the modded sprinkler valve, i'll just use my 3/8'' ballvalve, the max psi on it is 600psi, So could someone tell me how many psi can i put in my gun, it's a all galvanized pipe, piston gun and the trigger now is my 3/8'' ball valve.

[Orpackrat]

I have been using 1/4" though 1" ball valves with Co2 (800+ PSI) without any leaks even in high temperatures (higher pressure).

http://cgi.ebay.com/Purple-Tank-Adaptor ... dZViewItem

One of these, the outlet is 1/8" you can use pipe adaptors to get up to your chamber size and run it off of a paintball Co2 tank, I would recommend getting a 1" ball valve for you cannon and with the size of chamber you are going for, this thing will have lot's of power so install a long barrel, possibly from 2" PVC.