Pleatco PMA45-2004R-M Replacement Cartridge for Master Spas EP (New Style) (MICROBAN), 1 Cartridge Replacement cartridge for master spas new style EP-cylinder model 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-8341 and filbur FC-1007M; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea Measures 8-1/4-inches in diameter by 6-7/8-inches in length and 4-1/16-inches in top and bottom hole diameter