thanks again everyone!

thanks for the help guys. Anyone know if 3" o-rings ar emade or where i can get them if they are?

I think i'll need to use a threaded pvc fitting to attach to the valve, and then to an abs threaded thingy.

Aren't there specially made cements etc. to bond pvc with abs?

Or I could use a metal fitting to connect the pcv to the abs. Would this be better?

well abs isnt pressure rated so dont use it in a pneaumatic just use it in combustions

I'll be running the system off a co2 tank hooked up with a regulator to get it to about 100psi, then it will go through a watermaster sprinkler valve, and the abs pipe will only be for the barrel.

I assume ...

Does anybody know if ABS pipe is safe to the same pressures as PVC? From the look and feel of it, it seems much more sturdy. If anyone can let me know or give me a source where I may find out I would greatly appreciate it!

Thanks!