Like the name already says the O-Ring is a ring-shaped seal. This is often made of plastic, rubber or silicone. Depending on the material, the hardness of the seal differs (shore scale).
O-Rings will only work as long as they are clean. Therefore it is necessary to have them checked on a regular basis. Your favourite Diving School or Dive-Professional will be able to help you with that.
O-Rings for your underwater camera
Especially the ones of your underwater camera should be checked for minor cracks, cleaned and greased a little after every dive! Otherwise they might not stand the pressure during your next one.
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