4AN Male to AN3 Male Flare Reducer Coupler Union Adapter 4AN to 3AN Straight
Size: The thread size of the 3AN male coupler is 3/8-24 UNF. The thread size of the 4AN male coupler is 7/16-20 UNF. 4AN Male to AN3 Male Flare Reducer Coupler Union Straight Adapter Fitting Black. Seal: The AN thread of the flare is sealed by a 37-degree angle.