Don't have a Panthera or any other FX, but three days ago I got out my RTI Prophet and saw that it needed topped off, so Filled it and opened the bleed on the compressor and got a constant flow. Pulled the fill hose and the air poored out of the foster fitting. The first leak in the three years I have owned it, so no sweat, just set it aside and deal with it later.
I still wanted to shoot, so out comes the Talon P
Topped it off, opend the bleed valve, and a constant flow of air instead of the usual pssst. Diconnected and yup all the air in the bottle dumped. Two leaking Foster fittings in a row. What are the odds?
Both fixed now, but leaks are just part of this game. Just glad I have two complete oring sets for all of my guns.