Apeks Regulator Owner's Manual page 17

necessary to keep the interior of the regulator clean and the
percentage of oxygen below 40% along with the slow opening of the
cylinder valve (for regulators over 40% oxygen please see page 6).
To attach a yoke-style first stage to the cylinder valve, follow these
steps:
1. Partially unscrew the yoke screw of the first stage regulator so
that the dust cap can be removed from the air inlet.
2. With the cylinder valve facing away from you, release a small
amount of air from the cylinder by turning the hand-wheel counter-
clockwise to open the valve only slightly. When air is heard exiting,
immediately close the valve. This will clear any moisture or debris
that may be inside the cylinder valve outlet opening. Check the O-
ring is still in place.
3. Place the first stage regulator over the cylinder valve so that the
inlet fitting aligns with the O-ring of the cylinder valve, and the LP
hose of the primary second stage will be routed over the desired
shoulder. While holding the first stage in place, turn the yoke
screw clockwise. Ensure that the yoke screw mates into the small
dimple on the backside of the cylinder valve, and tighten finger-
tight only - do not over tighten.
4. If a submersible pressure gauge is attached to the first stage,
ensure that the gauge is facing away from you. Pressurize the
regulator by slowly turning the cylinder valve handwheel counter-
clockwise. Continue to turn the valve handwheel counter-
clockwise until it is fully open, and then turn it back
5. Listen near the first stage to check for any leakage. If leakage is
detected, immerse the first stage and cylinder valve while
pressurized to determine the source.
6. If leakage has been detected, follow the procedure for removing
the regulator from the cylinder valve on page 20. If air was leaking
between the first stage and cylinder valve, replace or re-seat the
cylinder valve O-ring as needed and repeat the above procedure.
If leakage persists, return the system to an authorized dealer.
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