Size: 3/4" NPT to AN6, the thread size of 6AN is 9/16-18 UNF. 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. 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.
