The Maxi 310 Shelf Beer Cooler is a Four Product Beer cooler, The Maxi 310 Shelf Beer Cooler features Four 5. 5 Metre Long x 3/8"Stainless Steel coils, Immersed in a reservoir which would provide an ice bank of approx 7. 5kgs. Add to this The Maxi 310 Shelf Beer Cooler has a built in pump to provide Water Recirculation which gives the user the facility to use the new Water Cooled Fonts now coming onto the market. Another use for the Maxi 310 Shelf Beer Cooler's Water recirc is for the cooling of cask ale where the Beer engine has a Water Jacket around the cylinder . The Maxi 310 Shelf Beer Cooler's water recirc facility is ideal for providing a supply of chilled water to Cask Cooling Saddles and Cask Cooling Probes. qv.