This Replacement filter cartridge is can handle the top load of 20 square foot and best fit for Hayward,CX200-RE, MicroStar-Clear C200, American Comander 11, Pentair Pool Products-American P. It replaces Unicel # C-4320, Pleatco # PA20-4 and Filbur # FC-1215 while meets the OEM # CX200RE specifications. This 11 7/8 inch long and 4 5/8 inch wide filter cartridge has 2 1/16 inch open holes both at its top as well as bottom. You get clean and water in your pools and spas by installing this high quality filter cartridge. Very easy to install this filter cartridge is made of superior grade of materials.