The Drink Tank comes equipped with a second lid, the keg cap tap lid. This lid turns the Drink Tank into a portable keg. CO2 can easily added to this lid system to flush out air trapped within the growler to preserve the beer like a traditional keg. This alone would be fantastic for the craft beer enthusiast as that growler of beer can now survive that two week trip to the beach or sit in your fridge while you work on other beers. But again, the Drink Tank takes this one step further. Since the keg cap tap lid turns the Drink Tank into a portable keg, why not provide a tap system to complete the conversion. And it does just that!