Size: 6AN flare to 3/8 " NPT, the thread size of 6AN is 9/16" - 18UNF, Degree: 90 degree elbow. Size: 6AN to 3/8 NPT. 1 x 6AN to 3/8 " NPT Male 90 Degree Aluminum Fitting Adapter. 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.