Shuts off the flow of fuel to the carburetor whenever the engine shuts off Ensures 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 motor Perfect fit for riders who need every drop of fuel available Installs easily into the existing fuel line and includes an auxiliary vacuum hose barb to install wherever there is a vacuum source on the engine CNC-machined from billet aluminum with a matte gray finish; 5/16" hose barbs Made in the U.S.A.. FUEL VALVE IN-LINE VACUUM