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The Filbur FC-0131 is the replacement filter for the UNICEL 4CH-20 R.
Guaranteed to fit or your money back!
The Unicel 4CH-20 Compatible Pool Filter Cartridge has an outer diameter of 4 5/8 inches, and a length of 6 3/4 inches. This Unicel Pool Filter has a handle style top, and a 1 1/2 inch open bottom with male threaded fitting (MPT). This Unicel 4CH-20 filter contains 20 square feet of Reemay spunbound polyester pleated filter media.