Sometimes you can avoid the popping noise if you have a shut off switch near the quick detach nozzle. When I used to paintball (I know... I know... disgusting...) I ran a remote line to my marker. It had a valve on the tank itself, but also a small piece near the nozzle that slid back and forth that could be used to cut off the pressure at the gun end. If you have that, turn it off there, then fire a blank shot if you can and you shouldn't get a pop when you disconnect.