OMS Airstream Evoque Regulator, Owner'S Manual

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This condition, referred to as free-flow, can usually be stopped by turning the second stage
so the mouthpiece is pointing down and the purge button is pointing up.
It is recommended to carry an Octopus (alternate air source) with the mouthpiece facing
down when not in use, turn the Venturi pad lever to the minimum setting or use a
mouthpiece plug or cover to prevent free-flow in case it is bumped.
During normal use underwater, a small amount of water collects inside the body of a
standard regulator in a natural reservoir near the bottom.
This is normal for most second stages, and the water is held away from your mouth
naturally and will go unnoticed unless you become inverted or do subaquatic somersaults at
which time you may experience temporary ‘wet breathing’.
Water can be purged from the small internal air space of most second stages by exhaling a
small puff of breathing air into the mouthpiece, or by blocking the mouthpiece with your
tongue and pressing the front mounted purge button to initiate a flow of breathing air.