Apeks Regulator Owner's Manual page 23

water diving procedures, and take special precautions to prevent
second stage icing. This training must include procedures for dealing
with regulator freeze-up, unexpected freeflow, and emergency out-of-
air situations. These procedures are taught in cold water training
programs provided by most recognized certification agencies.
The following measures will further reduce the risk of freeze-up:
1. Request verification from your dive store that the air in your
cylinder(s) is dry. It should have a dew point below -82ºF or -54ºC.
Excess water vapor can freeze, causing a freeflow condition, or
blocking the flow of air entirely.
2. Protect your regulator from any contact with water until the moment
that you are ready to begin your dive.
3. Protect your equipment from cold temperatures before the dive.
Keep your regulator and all its accessories in a warm, dry place.
4. Avoid breathing through the regulator or pressing the purge button
in very cold air before entering the water.
5. Avoid removing the regulator from your mouth during the dive. This
will prevent cold water from entering the regulator's second stage.
6. As far as is possible, avoid heavy exertion during the dive in order
to minimize the volume of air flowing through the regulator.
WARNING: SCUBA regulators and equipment have
operational limits when used in water colder than 50°F (10°C).
If you attempt to dive in cold water without first obtaining the
necessary training and preparation of your equipment, you
risk serious injury or death.
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