The easiest way to carbonate beer. This is a Cornelius keg lid withbuilt-in carbonation stone. Move the lid from keg to keg to carbonate asneeded. Allows you to force carbonate quickly using the attached .5micron stone with the portability of being able to move the lid from kegto keg. No more hassles of trying to attach and unattach line from the"gas in" dip tube. Simply connect your gas quick disconnect to the included fitting on the lid and allow carbonation to begin.