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You may have noticed that some 2nd stages have a lever on the side (like the RG-3100S) but what is it and what’s its effect?

Moving this lever switches the Venturi effect on or off, but what does that mean?

The Venturi Effect is explained as (Wikipedia):

The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section (or choke) of a pipe. The Venturi effect is named after Giovanni Battista Venturi (1746–1822), an Italian physicist.

Sounds complicated, simply put what it means is when air more through a small hole into a larger space it creates lower pressure.  In the 2nd stage what this means is that it make it easier to breath (you don`t have to suck as hard), or put another way when turned off it makes it less likely for the 2nd stage to free flow


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

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