Female AN6 to Female AN6, the thread size is 9/16-18 UNF. (AN6 90 degree). Female AN8 to Female AN8, the thread size is 3/4-16 UNF. (AN8 90 degree). Female AN10 to Female AN10, the thread size is 7/8-14 UNF.
AN Female to AN Female Straight Swivel Coupler Union Fitting Adapter Aluminum
HPS Aluminum AN Female to AN Male Reducer Coupler Adapter [Multi Sizes]
2PCS 10 AN Female to 8 AN Male AN Flare Fitting Reducer Adapter 10AN to 8AN
HPS AN Female to Female Swivel Coupling Adapter Fitting, Straight AN -12, Black
496106-BL Fragola -6 AN Female To -6 AN Female Coupler Union Fitting Straight
-8 AN Female To -6 AN Male Flare Fitting Reducer Adapter 8AN to 6AN Black