Fuel Pressure Take-off Fitting: The fuel pressure take-off fitting is an AN12 male to -12 female with a 1/8" NPT gauge/gage port. The thread size of the 12AN is 1-1/16-12 UNF. Sealing: The AN thread of the flare is sealed at a 37-degree angle, and the NPT thread is sealed with a 60-degree taper.