Sony MPK-DVF5M - Manual (Page 22)

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What Is an O-ring?
• An O-ring is part of the water-proof packing that is used on underwater cameras,
watches, and other diving equipments.
• The O-ring acts to preserve the waterproof qualities of the marine pack and other
equipments.
How the O-ring waterproofs
The surface of the O-ring contacts the rubber to prevent water from entering the gap.
When water pressure acts on the O-ring, the contact surface area of the
O-ring expands to increase the force acting on the groove on the marine pack.
O-ring maintenance is very important. If O-ring maintenance
is not followed according to instructions, this might cause a
water leak, and cause the marine pack to sink. The surface
of the O-ring contacts the entire rubber evenly to prevent
water from entering the gap.
O-ring
water
water
pressure
Note on the O-ring
O-ring