2 x 10AN Male to 8AN Male Flare. Size: Thread size of 8AN male coupler is 3/4-16 UNF, 10AN male coupler is 7/8-14 UNF. Seal: The AN thread of the flare is sealed by a 37 degree angle. Application: Male to male flares coupler usually used in fuel system, such as fuel hose extend, fuel pump, cooler system etc.