[Size] AN10 to 1/2" pipe, the thread size of 10AN is 7/8-14 UNF. 2 x 10AN Male Flare to 1/2" NPT Adapter Fitting. Size: 10AN to 1/2 NPT. [Sealing] The AN side of the flare is sealed by a 37 degree angle and the NPT thread side is sealed by a 60 degree tapered thread.