Pleatco PMA40SV-F2M-M Replacement Cartridge for Master Spa 5-15/16-Inch TALL 2-Inch NPT Threaded Cartridge， 1 Cartridge<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Replacement cartridge for master spa</li><li>50 Percent open ABS free flow cores maximize water flow through reemay filter media</li><li>Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span</li><li>Replaces unicel and filbur; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea</li><li>Measures 7-inches in diameter by 5-15/16-inches in length and 2-inches of bottom hole diameter</li></ul></div><img src="http://ecx.images-amazon.com/images/I/516%2BNTXxCQL.jpg" noproxy>