The spiral before pouring beer from the lager tank at the Brand brewery in the Netherlands.
https://cdn.masto.host/mastodonbeer/media_attachments/files/111/273/275/308/433/133/original/d4a014186b277993.jpg
When pouring beer from fermentation or lager tanks, more often than not the beer comes from a pipe that has a big spiral in it (pictured below). What is this for?
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