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1. Check the second stage IVS/RVS control switch to ensure that it is
set to the “MIN” (–) position prior to connecting your regulator to
the tank.
2. If present, gently turn the inhalation control knob “in” (clockwise),
only until it stops. Do not apply
excessive pressure.
3. If you are using a cylinder with
a yoke connection valve,
check the cylinder valve O-ring
is fitted and not worn or
damaged. If you are using a
high pressure cylinder with a
DIN connection valve, remove
the protector cap from the first
stage to inspect the sealing
O-ring of the DIN connector. If
the sealing O-ring is damaged
or worn, replace it before
mounting the regulator on the
cylinder valve.
Attaching the First Stage to a
Cylinder Valve (Yoke Connection)
WARNING: OPEN VALVES SLOWLY TO AVOID OVER-
PRESSURIZATION. When pressurizing your SCUBA system,
be sure to open the cylinder valve slowly to minimize the
generation of heat. Failure to do so, with Enriched Air Nitrox
(EAN) present, increases the risk of combustion that can lead
to serious injury or death.
It is considered safe practice, especially when using EAN, to open the
cylinder valve slowly and let the first stage pressurize slowly. Rapid
pressurization causes adiabatic compression of the breathing gas,
which generates heat inside the first stage. Heat, along with elevated
percentages of oxygen and an ignition source (from contamination)
are the ingredients that can cause combustion. This is why it is
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