You guys are funny no push in type fitting then you think the Shark Bite fitting are the best thing in world lol
I ran all my water lines in pex tubing, but I used all brass fittings with crimp rings. I just felt more confident in them than the shark bite stuff.
I don't know anything about modern air lines but like many here it would be a hard leap of faith for me to put modern "plastic" air lines in place of good old fashioned rubber and braid lines, or steel/copper hard lines, even though logically I know the new ways are indeed better. When was the last time you saw a copper line with a fatigue crack, or a corroded steel line, vs the same on a plastic line?
A couple of the hard lines I will be replacing have fatigue cracks right close to the fitting. My choices are to either replace the entire hard line that is broken, requiring me to make appropriate bends and get the length just right. Or option B which I have chosen is to just use dot plastic in it's place. Option B seems much easier and needs to be less precise. If I were working on brake lines, which I'm not, I might reconsider my strategy.