Counter-Pressure Bottler Another WilliamsWarn invention. This counter-pressure bottler allows you to bottle from a WilliamsWarn BrewMaster™, BrewKeg™ or Cornelius keg without losing any carbonation. The Bottler can accommodate bottles up to approximately 370mm (14 ½ inches) in height and 150mm (5.9 inches) in diameter. This allows a variety of bottle types to be used, including bottle sizes up to 3L (101 fl.oz.) growlers. Once the two hoses (gas and beverage) are connected via the simple push-lock fittings on top of the valve, you just open the gas side for a few seconds to pressurise the bottle and remove air, close that and then open the beverage side to allow beverage to enter. The beverage fills against a back-pressure and so doesn’t foam and doesn’t lose any carbonation. Pressure release and therefore fill flow rate are controlled by how open the varibable pressure valve is set. Check out the Instructional Video A 500ml bottle (1 US pint) can be filled in 40 seconds and a full WilliamsWarn brewery can be emptied in about 40 minutes (filled into 46 bottles), to then be cleaned ready for the next brew. The bottles are ready to consume out of immediately, as the beer is already carbonated. Take them to a party to impress your buddies.