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.