Slick set up that replaces the factory end cap/ foster fill. These use a probe, has a rotating cover to protect probe hole ... Or, as i did was leave the probe in & tie it down covering with a simple cap.
used on a regulated gun you can now see HP side pressure.
HuMa Air sells these direct for MANY gun models makes ... this one on a Custom Marauder.
See: https://www.huma-air.com/Quickfill-Probes
Scott S
