AN Fittings & Adapters

AN fittings, AN to NPT adapters, B-nuts, sleeves, unions, tees, plugs and 90-degree fittings for nitrous, fuel and oil lines.

 

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Buyer's guide

Reading AN sizes

AN size is the tube outside diameter in sixteenths of an inch: -3AN is 3/16", -4AN is 1/4", -6AN is 3/8" and -8AN is 1/2". Most nitrous feed lines are -4AN or -6AN.

AN vs NPT

AN fittings seal on a 37-degree flare, so they do not need thread sealant. NPT pipe threads are tapered and seal on the threads. Use AN-to-NPT adapters where a line meets a solenoid, bottle or block.