4AN Male to AN 3 Male Flare Reducer Coupler Union Straight Adapter Fitting New.

Size: Thread size of 3AN male coupler is 3/8-24 UNF, 4AN male coupler is 7/16-20 UNF. Application: Male to male flares coupler usually used in fuel system, such as fuel hose extend, line connect to fuel filter, fuel pump, cooler system.