Panasonic LUMIX DMW-MCTZ7 Manuel D'utilisation page 9

What is the O-ring?
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The O-ring is a waterproofing packing used for underwater cameras, watches and
diving equipment.
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The O-ring keeps the Case waterproof by sealing the gap between the rear case
and the front case.
∫ How the O-ring keeps the Case waterproof
The gum comes into contact with the sides of the Case making the
Case waterproof and stopping water from entering from the gap.
O-ring
When water pressure acts on the O-ring, the surface of the O-ring
expands and the Case is sealed more tightly.
The O-ring prevents water leakage by coming into uniform
contact with the sides of the Case. Therefore, good care of the
O-ring is very important. Incorrect care of the O-ring may
cause water leakage.
Digital Camera
Rear Case
O-ring
Front Case
O-ring
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