Variable Capacity tanks, also called Variable Volume tanks, made in Italy by Marchisio. This style of tank features a ‘floating’ lid with an inflatable gasket that can be positioned at any height in the tank. Use the included air pump to inflate the lid gasket. Whether you position the lid directly on the liquid, just above, or at the top of the tank is up to you. They are used as affordable stainless production tanks for applications ranging from winemaking to pickled foods and Kombucha.