Check the listing for details. Male to Male Flare Union Coupler Fitting Coupling Aluminum Straight Black 2PCS. Color: Black, Condition: New. Listed at 8.99 USD. About this itemPack of 2Size: Thread size of 3AN male coupler is 3/8-24 UNF, 4AN male coupler is 7/16-20 UNF. Size: Thread size of 4AN male coupler is 7/16-20 UNF. Size: Thread size of 4AN male coupler is 7/16-20 UNF, 6AN male coupler is 9/16-18 UNF. Size: Thread size of 6AN male coupler is 9/16-18 UNF. Size: Thread size of 6AN male coupler is 9/16-18 UNF, 8AN male coupler is 3/4-16 UNF. Size: Thread size of 8AN male coupler is 3/4-16 UNF. Size: Thread size of 6AN male coupler is 9/16-18 UNF, 10AN male coupler is 7/8-14 UNF. Size: Thread size of 8AN male coupler is 3/4-16 UNF, 10AN male coupler is 7/8-14 UNF. Size: Thread size of 10AN male coupler is 7/8-14 UNF. Size: Thread size of 10AN male coupler is 7/8-14 UNF, 12AN male coupler is 1 1/16-12 UNF. Size: Thread size of 12AN male coupler is 1 1/16-12 UNF.Seal: The AN thread of the flare is sealed by a 37 degree angle.Parameter: Working pressure: 1500PSI; Working temperature: -65°F-252°F.Material: Made of aluminum alloy 6061-T6.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.