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; 7,9 mm (5/16") hose barbsMade in the U.S.A.