ADJUSTABLE FOR CENTER-TO-CENTER COMBINATIONS OF Holley 4150 and 4500 dual feed carburetors with 7/8"-20 inlet size CNC-MACHINED FROM BILLET ALUMINUM, these fuel logs (fuel lines) feature three internal o-ring seals, carb fittings, 1/8" npt fuel pressure gauge port and plug FEATURES log inlet (feed) -10AN, log outlet (return) -10AN port (includes port plug), and log to carburetor: -08AN BLACK ANODIZED for great looks ONE PER PACKAGE with other sizes, colors, and styles available separately Billet Adjustable Fuel Log (Fuel Line)Holley 4150/4500 Dual Feed CarbsLog Inlet (Feed) -10ANLog Outlet (Return) -10AN Port (Includes Port Plug)Log to Carburetor: -08ANCarburetor Inlet: 7/8"-20