Light & Motion Bluefin SR11, Owner'S Manual, Page: 22 / 28

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O-ring Care & Maintenance
O-rings are the critical component that keeps water out of the housing. Routinely
inspect O-rings and replace at least once a year. If your O-rings are damaged, contact
your Light & Motion dealer for an O-ring replacement kit.
Follow these steps for proper O-ring function.
1. The sealing system used on the monitor back incorporates two O-rings. This is
the most critical area of the housing for maintenance and should be inspected before
every dive.
2. Make sure the monitor back O-rings and the mating surface on the inside of the main
housing are free of grit, hair, lint and anything that could breach the O-ring seal.
3. After frequent diving or if O-rings appear dirty, remove O-rings and clean the
grooves. To remove O-rings, use finger pressure or the rounded edge of a plastic
card to lift the O-ring out of the groove.
Note: Never use a metal object to remove an O-ring. It will
cause damage to the O-ring and mating surface.
4. To check O-rings for damage, place the O-ring between the index finger and thumb.
Then pull the O-ring through your fingers, feeling for any debris or wear.
5. If O-rings are dirty, it is best to replace them. Washing dirty O-rings with soap and
water is not recommended. Soap breaks down the lubricants and will compromise
the integrity of the seal.
6. Properly greased O-rings will help maintain sealing integrity and minimize O-ring
degradation. Use enough grease to lubricate the O-ring thoroughly, but not so much
that it will attract additional debris.
7. Clean the groove with a lint free swab or the folded edge of a paper towel.
8. All of the front optic ports for the housing also utilize two O-ring seals. Also check
these seals every time the optic is removed.
O-ring Parts
Bluefin O-ring Replacement Kit part # 802-0096 includes:
Two O-rings for the monitor back and two O-rings for front optic.
Smart Grip O-ring and Battery Kit part # 802-0117 includes:
One O-ring and two batteries for each Smart Grip.
Note: O-rings used for the Monitor back and all optics are different sizes. Be sure to
replace the appropriate O-ring in its respective groove.