spile hole?
atmospheric pressure. A correctly set up cask breather system maintains the pressure in the head space at atmospheric pressure. This sounds ideal, but there are arguments for against and alternatives. The argument for is basically that the beer keeps longer and the end of the cask has a better head. The arguments against are basically: Even at 1 atmosphere the beer takes up much more CO2 and the sterile atmosphere prevents ageing. The alternatives are basically: If there is no problem then do nothing. Plan to use casks in about three days. If demand isn’t present then don’t stock it or use a smaller cask size. Use nitrogen.
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