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After replacing the lid, make a final visual inspection of the main O-ring for contamination (Fig. 10).
(Fig. 10)
Note: If the O-ring is in good contact, a thin black line, about 0.5 to 1mm in width should be
visible, where the O-ring is in contact with the lid. Follow this line all the way round the edge
of the seal, as a final check that the seal is good. The housing is now ready for the dive.
Important !!! Before diving, make sure the pressure release plug is pushed
back inside and then screwed home, do not over tighten this plug (finger
tight only).