Olympus Silicone O-Ring for the PT-017 Underwater Housing.

Product Description
Replacement O-ring for the PT-017 Underwater Housing. Creates watertight seal. Underwater photographic equipment cannot be watertight unless the O Rings that seal it are flawless. Olympus recommends the O-ring is replaced by a new one at least once a year. See your PT-017 instruction manual for more information. Underwater photographic equipment cannot be watertight unless the O-rings that seal it are flawless. Always carry spare O-rings in your camera case. O-rings are the most important components of your underwater camera system. If the O-ring is lubricated, it will be elastic enough to shape itself uniformly around the channel. If it is dry, there will be too much friction to allow it to reshape itself uniformly. It will not safeguard against flooding. Every time you open the camera to change film, examine the O-ring and service if necessary. Always clean and lubricate after every diving day. When in doubt about the sealing capability of an O-ring, always discard and replace. Never use a sharp or pointed object to remove an O-ring! Use the O-ring remover tool. Don’t overgrease! Too much grease attracts debris that will disrupt the seal and cause flooding. Silicone grease is not a sealant; it only protects the O-ring from abrasion. A perfectly greased O-ring looks moist and shiny.

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What Is The Best Way Not To Be Eaten By A Shark While Scuba Diving?

There was something on the history channel awhile back about the sinking of some war ship. Thousands of men went into the water – lots of noise – and very few survived the shark-infested waters.
One theory was that the ones who did survive remained vertical (as if standing upright) instead of floating on their backs or on debris. It’s thought that the men who stayed vertical in the water resembled seals the *least*. And thus the sharks passed them over.
There is also a device called Shark Guard which, when attached to the wearer, sends electrical waves that sharks don’t appreciate. When they come within a certain distance of you it’s painful for them so they swim off.