Install the O-ring
Confirm that no foreign matter is in the groove and then fit the O-ring. At
this time, confirm that the O-ring does not stick out from the groove.
Before attaching this product to the Case, make sure that there is no hair,
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fiber, grains of sand or other foreign matter adhered to the O-ring or to the
contact surface (Case). Even a single hair or a single grain of sand may
cause water leakage. Please check with special care.
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