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Almost every diver has heard the phrase "Turn your tank all the way open and then back off half a turn.". A lot of divers still do it that way because that's how they learned it. But why do you reverse this half turn (some also speak of a quarter turn)? And above all: Should you really make this turn? Let's take a closer look at this. How it started Back in the days, cylinder valves were not built as precisely and reliably as they are today. Therefore, it often happened that