I have two quick connect fittings on my water separator so make it easier to install it. Ive done it where you just spin the existing hose fitting on there and all it did was cause the hose to leak after that, so now I just use the quick connect fittings and I don't have to twist the hose around 50 times either. Anyways, I unhookd the inlet side of the hose and it drained all the air in the compressor, oops next time i'll shut the ball valve. Anyways I noticed I still had pressure showing on the regulator gauge and it went to zero once I reconnected the hose. I was just trying to re route my hoses a little bit neater, so I think the pressurized hose on the outlet side of the water separator backflowed back into the tank. How does that even happen? Does that mean I just transferred all the water in the separator back into the compressor?