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Ok I was thinking about doing braided lines in my engine bay but I dont understand the fittings and the different types and different purposes. I feel dump for asking these questions. But what is a AN fitting and stuff like that. HOw do you determine what size braided line to use? God I just feel really really dumb.

 
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AN stands for Army/Navy. It is a 37 degree taper that seals without o rings or teflon sealant. The hose is a compression fit into a sleeve that is threaded onto the fitting. When someone says -3 or -4 AN it means that they are refering to 3/16" or 1/4". Each -1 is 1/16". So when someone says they are running -6 fuel line, it is 3/8".

 
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is there something I can print out with all of this info so i can refer back to it lol. Isnt there some catalog i can buy?

 
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Yes, Here. Or you can call and get a catalog for free.

 
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Im just guessing that you can also buy the stuff locally, after all I live in Boise idaho and there are 2 shops( not auto performance shops ) that have HUGE selections of braided line and fittings. Check your yellow pages for hose fittings. Good luck.