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This Equinox O-Ring is used to waterproof the Equinox 4" dome to the housings faceplate. The 4" dome comes standard on all Equinox HD8, Pro8, HD6, and Pro6 housings. The O-ring resembles a thick rubber band and 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.