BFITS: C4326 UNICEL C-4625 SPA FILTER FC2375 PLEATCO PRB25 (2) Pack Cartridge 25 sq ft ReviewbP PP FITS: C4326 UNICEL C-4625 SPA FILTER FC2375 PLEATCO PRB25 (2) Pack Cartridge 25 sq ft P-Bottom Opening: 2 - 18"P-Top Opening: 2 - 18"P-Outside Diameter: 4 - 1516" (Also replaces 5")P-Length: 13 - 516"P-REMAY Filter mediaP