You need some kind of cask breather to let the beer out but not let air in. One member @CD (use search) designed his noddy system so he could finish the fermentation in a plastic pressure barrel and the CO2 would be collected in a balloon which (the CO2) then refilled the space when the beer was drawn off. A little searching on this form will pay dividendds.Cask ale, pref straight from the cask.
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