Replace the lid:
Remember to pull the pressure release plug all the way out while closing the lid, otherwise the air
cannot escape.
Squeeze the lid closed all the way, you will hear the hiss of air being expelled.
Screw home the pressure release plug:
There is no need to excessively tighten this plug. The internal O-ring makes the seal. The O-ring on
the underside of the plug is just to keep the shaft dirt free.
After replacing the lid, make a final visual inspection of the main O-ring for contamination.
Note!
If the O-ring is in good contact, a thin black line,
about 0.5-1mm 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.
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