Checking The Gasket - Fantasea FS-5 Operator's Manual

Underwater photographers will probably want to set the flash
mode to the flash always setting to insure they always have a
flash with every exposure. It is also wise to set the focus mode
to allow the lens to focus in the macro range for capturing great
images of the tiny and exotic subjects that you can find underwater.

Checking the Gasket:

Prior to each closure of the housing the gasket seal should be visually
inspected. If there is any debris present, including dirt, sand, dust,
hair, grease or other matter, it must be cleaned to insure a proper
watertight seal.
Cleaning the gasket is a simple matter of wiping it with a damp, soft
cloth to remove the foreign matter. Be careful the cloth you use does
not leave any of its own material behind as this can also affect the
effectiveness of the gasket. It is not necessary to remove the gasket
for cleaning unless visual inspection determines that there is foreign
matter underneath the gasket as well. If this occurs, be sure the
surface of the housing is also clean and wiped free of any debris.
Gasket
Info:
Since the gasket on the Fantasea FS-5 are face-to-
face/compression sealed, and is not subject to friction
as it is closed, there is no need to lubricate it. Grease
or any other form of lubrication does not help seal
the housing. It only reduces friction, which is
commonly present if the housing has an O-ring seal.
Lubricating the gasket before use could cause it to
slip out of its groove, and not form a proper seal:
therefore no silicon or other lubricants should be used.
The gasket should also be checked visually for any
cracks or perforations. If any part of the gasket shows
signs of wear or damage, it is imperative that it be
changed before going into the water.
If the gasket is removed from the channel groove it
sits in, be sure to get it completely back into place so
it is properly seated. Starting at one corner, press the
gasket with your finger and feel it seat into its channel
groove. Then continue this procedure continuously
in one direction, round its perimeter, until the entire
gasket has been pressed flat into place. Go over it a
second time to be sure it is properly in place. Then
you are ready to clean it, give it a final visual
inspection, and close the housing.
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