Keg-King Guten Brewery Jackets are fantastic for improving the heat efficiency of these brewery units. By fitting a jacket on your brewery unit, you will notice faster heating times and experience up to 50% less heat loss from the vessel. Available in 40L and 50L sizes, the jackets are made of heavy duty, easy to clean neoprene. The Velcro seal makes them easy to install and remove. These jackets provide a simple solution to make your Keg-King Guten Brewery even more heat efficient and easy to use.