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The Omnifilter 4000R-S3-S06 is a replacement water filter for the following water filtration systems:
The Omnifilter 4000R Filter Cartridge Set - 2 Filters is a reverse osmosis water filter. This replacement filter cartridge is a quick change filter. These replacement RO filters come 2 in a pack.
The Omnifilter 4000R-S3-S06 specifications: