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The Olympus O-Ring is for the main seal on the housing body of the underwater housing PT-E06. The housing PT-E06 is for the Olympus E-620 digital Camera. The o-ring resembling a thick rubber band is designed to establish a watertight seal when going underwater. Manufactured to precision tolerances required to hold a pressure seal on your housing and made of elastomeric material, it provides the means by which a watertight seal is formed.