Replacement cartridge for eco-pur models * 50 Percent open ABS free flow cores maximize water flow through reemay filter media; microban inhibits the growth of stain and odor causing microbes * Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span * Replaces unicel and filbur; made in usa * Measures 3-7/8-inches in diameter by 7-1/8-inches in length; measures 2-1/8-inches top hole and 2-1/8-inches bottom hole diameter