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The Rx Clear® Radiant 150 sq. ft. Cartridge Filter Replacement Mid-Tank O-Ring will ensure the proper operation of your filter. Mid-tank O-rings are an important part of your filter that should be kept adequately lubricated and replaced when needed as regular maintenance. This ring serves as a replacement part for the Rx Clear® Radiant 150 sq. ft. Cartridge Filter for inground swimming pools.