Correction
The kid at Auto zone got it wrong (surprise)
It isn't a 7/16-20 bubble fitting on the hose
It is an 1/4" AN flair (which has 7/16-20 thread)
In automotive terms a #2 AN (or #3 haven't looked it up)
Still have to find an adapter that doubles as a strain relief but this size makes more sense.
Also have the option of another hose that has it all.