Aeromotive Fuel Systems - AN vs NPT vs ORB – what's the difference? AN (army/navy) fittings have straight threads and seal using a SAE 37-degree flare. NPT (national pipe thread) means it
90° MALE STRAIGHT THREAD ELBOW, 1-1/4" SAE ORB X 1-1/4" 37° JIC : IRONTIME SALES INC.