18
REGULATOR SECOND STAGES
WARNING: Even if your First Stage is properly prepared for use in harsh
environmental conditions, only proper training will protect your Second
Stage from the effects of the environment.
FEATURES AND OPERATION
The Second Stage of the regulator assembly receives breathing gas at an intermediate
pressure of approximately 140 psi from the first stage and delivers it to you at ambient
pressure during inhalation. When you stop inhaling, it then shuts off the flow of breathing
gas and provides a path for exhaled gas.
All Second Stage regulators have a level of sensitivity that can result in excess breathing
gas being expelled when the Second Stage is not in your mouth while in the water. When
this occurs, it is usually during entry or when on the surface.
This condition, refered 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. (See Omega II
for an exception to this general feature.)
Recommended is to carry an Octopus with the mouthpiece facing down when not in use,
or to use a mouthpiece plug or cover to prevent free-flow in the event that it is bumped.
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