The same feature as OEM vacuum fuel valves - when valve is left in the "on" position with the motor off, fuel flow is shut off automatically High-quality, lustrous chrome finish is the same as Pingel's Power-Flo line of fuel valves Will also fit '84-'93 models if a vacuum source is tapped Outlet is a single 5/16" hose barb and will accept the stock vacuum line Available for '75-'93 models with a 22mm external thread - will also work for '94-'99 models with 22mm thread to eliminate vacuum shut off - available for '66-'74 tanks internally threaded for 3/8 NPT All descriptions are made from a seated position on the motorcycle with a reference from outlet position to the reserve position of the fuel valve lever. Made in the U.S.A.. VAC GAS VLV 22MM LFTFWD