someone that has experience, how does the nipple where the air comes in not leak, or does it just not by default? or on that gun do you not take the air hose off?

pretty good for a first gun, tell me, somebody, where you get the trigger valve. i have been looking on ebay and other places like google for weeks and no luck.

where would I be able to find some parts for a spud gun? like a trigger valve, or 3" diameter pipe:?: