Shuts off the flow of fuel to the carburetor whenever the engine shuts offensures a minimum of fuel spillage out of the float bowl vent if the motorcycle is dropped on its side, helping keep fuel off a hot motorperfect fit for riders who need every drop of fuel availableinstalls easily into the existing fuel line and includes an auxiliary vacuum hose barb to install wherever there is a vacuum source on the enginecnc-machined from billet aluminum with a matte gray finish; 5/16" hose barbsmade in the u. S. A.