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Kirby Morgan 37 & 57
© Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 080508001
Oral/Nasal
Mask
Regulator
Mount Nut
O-ring
Equalizing
Device
Valve
Body
Oral/Nasal
Valve
7.8 Oral/Nasal
7.8.1 Oral Nasal General Information
The oral/nasal mask is used to control and maintain
low carbon dioxide (CO2) levels in the helmet and to
isolate the microphone for more intelligible speech.
The oral nasal mask and the parts associated with
it are easy to access.
7.8.2 Oral/Nasal Removal
Tools Required:
7/16 inch Open-end Wrench
The oral/nasal mask is easily replaced.
1) Remove the nose block device first. See chapter
8.
2) Remove the microphone.
3) The oral/nasal mask can then be pulled off the
regulator mount nut. It is held on by a snap fit.
7.8.2 Inspection of Oral/Nasal
1) Inspect the oral/nasal mask. If it is torn, damaged
or aged it must be replaced.
2) Inspect the oral/nasal valve. If it is torn or dam-
aged it must be replaced.
3) Remove the valve body by pushing it out of the
oral nasal.
4) Remove the old valve by pulling it out.
5) Install the new valve by feeding the thin tail
through the valve body and pulling on it until the
valve is seated. Cut off the excess “tail.”
6) Install the valve body in the oral nasal. The valve
MUST be on the inside of the oral nasal.
Never dive with a Kirby Morgan helmet
without a properly functioning oral/nasal
mask. Without an oral/nasal, dangerous
levels of carbon dioxide may accumulate
in the helmet. This can lead to uncon-
sciousness and death.
WARNING
The nose block device MUST be removed
and reinstalled when installing a new oral
nasal mask. Simply stretching the oral nasal
mask over the nose block device can cause
the oral nasal mask to tear. Do not use a torn
oral/nasal mask. This can lead to dangerous
levels of carbon dioxide in the helmet.
WARNING