These brass, knob-style enrichers fit S&S Super E and G carbs and are perfect the accoutrement to your bitchin' bike with a velocity stack or other custom air cleaner assembly. This replaces the stock-style choke lever found on your S&S backing plate. This features an ON or OFF position. Installs in moments on your Harley-Davidson, or any other make motorcycle running an S&S Super E or G carburetor.