I used to get the warsteiner ones and a mate bought me over a bitburger one. The bitburger ones are a nightmare. The top bung you push in to let air in when the beer stops flowing. What they don't tell you is you then cannot seal it again. So you have to drink all 5 litres in one sitting!
The warsteiner ones you just have another air valve on top that you can close. Is this the same?
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