How To Use Fob Draft System Once your beer keg runs empty, you’re usually left with messy beer froth and foam. When you have a FOB installed and your keg is full or when the beer is flowing, a float inside the FOB remains at the top. When a keg goes empty the float instantly drops to the bottom like suction. This suction acts like a plug in a sink, creating a seal that prevents any air or gas from entering the beer lines.
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