Thanks @TinWhisperer
This is the air line between the pump going into the tank.
This fitting doesn’t have a ferrule (sleeve in your image)
The 1/2" O.D. tube fits inside the male fitting. There seems to be a sleeve integrated into the nut. I cannot slide the nut up the tube to see what it is. I cannot find a similar fitting this size on line to identify what it is.
I read you don’t use compressing fittings on gas/compression over 125 psi. I guess the is just air flow as the Quincy decompreses this line after the pump stops so the motor doesn’t have to start under load.
I suppose I can cut into the tube, put flares on it and just crack on from there.
