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We are an authorized Unicel dealer!This package includes 4 filter cartridges.25 Sq FtLength: 13 5/16"Outside Diameter: 4 15/16""Top Hole: 2 1/8" OpenBottom Hole: 2 1/8" OpenPleat Count: 106Works in Rainbow Dynamic Series I,II,III, and IV (17 2327)Replaces part number:Filbur: FC 2375Pleatco: PRB25 INUnicel: C 4326MADE IN THE USA!Unicel replacement filter grids are recognized as the best grid replacements in the industry. They have received numerous awards year after year for their performance and quality of products. We are an Authorized Unicel Dealer. An appropriate cleaning schedule will both help the performance of the filter and keep it from breaking for longer periods of time. However, it is not a permanent part and standard use will result in the need for a replacement. Make sure you go with the highest quality standard of replacement: Unicel.