nz-cannon Hi, The threads on the paint ball valve on the tank are, Internal threads 5/8 -18 External threads 1/2 -14 NPS The gas conpany name 320 asa. The pin that stick out of the 320 end is about 0.100 of an inch. The next peace is an UHM flat washer which seals the Co2. The pin is a brass 1/4 hex...