Pleatco PWW10-JH-PAIR Replacement Cartridge for Waterway Skim Filter10， 1 Cartridge<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Replacement cartridge for waterway skim filter10</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 C-4310 and filbur FC-3077; made in usa; microban inhibits the growth of stain and odor causing microbes like bacteria and algea</li><li>Measures 4-1/4-inches in diameter by 4-inches in length and 2-1/16-inches of top and bottom hole diameters</li></ul></div><img src="http://ecx.images-amazon.com/images/I/510Zxp%2BEl%2BL.jpg" noproxy>