You attach a bottom line to the end of the grip/trigger frame, then, a hose goes from their to the valve. Your air source screws into the bottom lines.
Or if your using Co2. A line from the donkey to a Front bottle mount or other anti liquid device up front, then to the valve Via another line and a snap conector.
If its an air system that isnt screw in, then fix the reg on the bottom of the grip.
if ita an RT or E/Xmag then it needs air.
Gaz
Yeah, you'll need an ASA adapter. Attach the ASA adapter to the bottom of your grip frame, then run a hose (steel braided or macro line) from there to the valve, or from there to a reg/x-chamber and then to the valve.