You need this to properly rebuild your Flo-Jet carburetor.
Exactly what I needed to finish rebuild of the Flo-Jet carburetor on an old 3 hp motor. My choke lever was broken, and the only way to replace it is to remove the choke shaft from the choke butterfly . . . and the only way to do that is to remove this plug. It's not included in the factory carb rebuild kit.