Ok stupid question time. I understand Double Flares, I know NPT is National Pipe Thread , But what the heck is an "AN" fitting? I have been looking at fuel filters and some are listed with 8AN, 10AN, 12AN fittings. A little Help please. What do they fit Is it going to be a metric size?

Jessica's Truck

The true definition of insanity:
To do the same thing the same way repeatedly and expect a different result each time.