Quote Originally Posted by Max
Ok I see- so I guess I need some hydraulic adapters but first I need to know the threads:
1) what thread is on the on/off valve? I think it is the same as the one coming out of the valve on a co2 fire extinguisher
2) what is the thread on the Trevor regulator?
Thanks
NOT THE SAME!

American CGA 320(Compressed Gas Association )
0.825-14 threads per inch NGO( National Gas Outlet )
on your paintball valve ... a 1/2 BSP nut will screw on but a standard nut is no good for your/our application.

British BS341 No. 8 ( British Standard 341 Part 1 (.860 in x 14 threads per inch) )
European DIN 477 No. 6 ( 21.8 mm 14 threads per inch ) for a CO2 cylinder valve /nut.