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30. Install the Cover Ring and hand tighten until there is no gap between the Housing and the
Purge Cover.
Final Check
31. With pressure applied to the regulator assembly immerse the entire regulator to check for air leaks.
Air leaks are most commonly caused by damaged or contaminated o-rings. Repair or replace
as necessary.
32. Release the pressure from the regulator assembly keeping the assembly mounted to the closed cylinder
valve. Apply a vacuum to the Dual Octo until movement of the diaphragm is detected. Stop applying
the vacuum and observe whether air is leaking back into the Housing. Sources of leakage must be
corrected and are usually traceable to a damaged or improperly installed a) Diaphragm,
b) Mouthpiece or Mouthpiece Boss or c) Exhaust Valves.
33. Pressurize the regulator and depress the purge to verify that a strong flow of air is available. If the flow is
slight, the position of the Demand Lever is probably the cause and a correction should be made. Repeat
Step 25 or replace Demand Lever if necessary.
34. If a regulator test bench is available check to verify that the cracking pressure is between 0.75 and
1.5 inches of water. If no bench is available, cracking pressure can be verified by slowly immersing
the pressurized Dual Octo with the mouthpiece in an upward position. The regulator should begin to
deliver air when the Diaphragm is 0.75 to 1.5 inches below the surface of the water. Be certain to
allow the regulator to completely dry before storing in a closed container.
WARNING – If the sources of leakage into the Housing are not resolved the user may
be exposed to entrance of water into the regulator while diving. If this is not treated
with an appropriate response the user may become stressed and subject to risk of
serious injury or death.