I'd buy a male QD fitting from Leroy Roduner at BGMF airguns dot com and get rid of the fill probe. That's what I did for my Sam Yang 909 and I'm glad I did. Leaky fill probe o-rings are no fun.
And they WILL leak. It's just a matter of when. Usually at the worst possible time. Mine only lasted for 2 fills. Instead of installing the spares that came with it, I ordered the QD fitting from Leroy. You won't regret it.