Nikon WP-CP4 Mode D'emploi page 26

Cleaning
Do not use detergents or volatile chemicals such as alcohol or thinner when cleaning
the case. Failure to observe this precaution could result in damage to the case or O-
ring.
18
Grease the O-ring
If the O-ring is not properly greased, it may crack
or peel, causing leaks. If the bottom of the O-ring
appears dry, place a drop of O-ring grease on your
index fi nger and spread grease on the O-ring by
sliding it between your thumb and index fi nger,
gently stretching the ring. Do not use cloth or
paper, as these may leave fi bers on the O-ring.
Note that applying too much grease may cause
foreign matter to adhere more readily to the ring,
preventing the case from sealing properly.
Replace the O-ring
Making sure the O-ring and guide are free of
foreign objects, place the O-ring so that it runs
evenly at the same level all the way round the O-
ring guide, without undue stretching and without
protruding from the guide.
Check the seal
Close the case and check that the case is fully
sealed. If the O-ring does not form a perfect seal,
open the case and adjust the O-ring to prevent
leaks.