Professional Products Carburetor Extension Fitting for Holley features carburetor extension fittings threaded into Holley carburetors with 7/8-20 inlets and allow the connection to a -8 fuel inlet line. Application includes: the Holley dual feed 750 through Dominator 1350 Series. And a 7/8 inch -20 thread. The overall length is 3.25 inches. The quantity is 2 per package.