Pentax EG-2990i Instructions For Use Manual page 21

WARNING:
If air bubbles discharge continuously from the distal end of the endoscope
during inspection, it is possible that the O-ring may be damaged, installed
incorrectly, or the air/water feeding valve may be damaged or installed
incorrectly.
If the device is used in this condition, it could cause infection by cross
contamination to the patient as result of reflux or spit-back of patient
fluids from the valve or damage the patient's body cavity. Also, the air
could be delivered to the patient's body excessively as well as continuously
and expose the patient to pain and suffering and/or cause damage as
result of gas embolism, etc.
Therefore, if the aforementioned characteristic was observed, make sure
to replace the O-ring or the air/water feeding valve with fully reprocessed
new ones which have already been subjected to a high-level disinfection
or sterilization procedure (O-ring set, model OF-B192, and the air/water
feeding valve, model OF-B188 can be used) and perform the inspection
again.
Since the check-valve can NOT be replaced by the end user, replace the
entire A/W valve with a new one if the check valve is damaged/missing.
b) Install the valve into the A/W cylinder by gently pushing the valve into the
cylinder. Never apply excessive force to push the valve into the A/W cylinder.
c) Connect the endoscope to the video processor. Turn air pump "ON" to desired
pressure setting. Place the endoscope distal tip into sterile water and confirm that
no air bubbles exit the distal air nozzle.
d) To inspect air delivery, cover the hole at the top of the air/water valve and
confirm that air flows freely from the air/water nozzle at the endoscope distal tip.
e) By depressing the air/water feeding valve, the water delivery system is activated.
Water should flow in a steady stream from the air/water nozzle at the distal tip
of the endoscope. (This may take several seconds on the initial attempt.) USE
STERILE WATER ONLY.
Action
Result –
Air Water
Feeding Feeding
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