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So, what is the difference between a balanced and unbalanced second stage?

The second stage has a spring holding the valve shut, in an unbalanced second stage, the forces on each side of the spring are different; affecting how easy it is to breathe.

In a balanced second stage (like the Aquatec RG-3100S), some of the intermediate pressure is directed to one side of the spring to make it easier to breathe, especially if breathing hard or at depth.


RAID Examiner, and director of Diving Solutions (Asia), in Singapore.

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