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 automaticallyHigh-quality, lustrous chrome finish is the same as Pingel's Power-Flo line of fuel valvesOutlet is a single 5/16'' hose barb and will accept the stock vacuum lineAvailable for '75-'93 models with a 22 mm external thread - will also work for '94-'99 models with 22 mm thread to eliminate vacuum shut off - available for '66-'74 tanks internally threaded for 3/8 NPTMade in the USAAll 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.Will also fit '84-'93 models if a vacuum source is tapped.