AN fitting help

You first need to know what kind of hose you have. Is this common low pressure "hose barb and clamp", or "push lock" or some sort of braided hose that takes a 2 piece fitting/

Next be really sure it's actually AN and not SAE. Caliper the threads and refer to a reference...........thread size chart..........

Technical Information and Support - Russell Performance Plumbing

Thing is, there are ALL kinds, hundreds, maybe thousands of fittings, some made by proprietary "niche" manufactureres