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The PBW4PAIR Compatible is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The PBW4PAIR Compatible Pool Filter - 2-Pack has an outer diameter of 4 1/4 inches, with a length of 3 3/4 inches. This Unicel pool filter has an open top and bottom with both having diameters of 2 1/8 inches. This Unicel C-4313 filter contains 3 square feet of filter media.