The bend might be a little to tight for the blue air line going into the solenoid??
and as far as disconnect goes..... If my memory is still working right,
You just push the blue line into the orange fitting, and and at the same time push in the orange color ring fitting into the solenoid, keep the orange ring pushed in, then just pull out the blue tubing I sometimes they don't get pushed in far enough
I hope that answers your ???