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A small but critical component of the Olympus PT-E05 Underwater Housing for their E-520 Digital Camera, this POL-E05 (B) O-Ring provides the waterproof seal that protects your valuable investment. Made of elastomeric silicone for high resilience and flexibility, the O-ring is manufactured to the precise tolerance levels required to withstand water pressure on dives. It is included with the housing and offered here as a spare or replacement part. Please remember that a pressure test or immersion without a camera inside the housing is mandatory after changing any O-ring. Failure to perform this test could result in serious damage to your camera and lens should the O-ring be improperly installed.