Pleatco Replacement Cartridge for Hayward Super-Star-Clear C4000, SwimClear C4020, Super-Star-Clear C4000S, 1 Cartridge Hayward super-star-clear c4000, swimclear c4020, super-star-clear c4000s 50 Percent open ABS free flow cores maximize water flow through reemay filter media Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span Replaces unicel C-7487 and filbur FC-1270 ; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 7-inches in diameter by 25-1/2-inches in length and 3-inches of top and bottom hole diameter