Pool Filter Replaces Unicel C-4440， Pleatco PSD40-4， Filbur FC-2710 Filter Cartridge for Swimming Pool and Spa<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Media Area 40 sq ft， 4 5/8" OD， Castle Top， Open Hole: 2 1/16" Bottom， 16 3/4" Long， AK-3031</li><li>Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life</li><li>40 sq. ft. 4000 Series Cartridge for Sundance， replacement of Unicel C-4440， Pleatco PSD40-4</li><li>Baleen Filters Top:Castle Bottom: Open Hole: 2 1/16"</li><li>Guaranteed Perfect Fit - Extremely Durable - Wash &amp; Reuse - Most Energy Efficient - Withstands High Pressures &amp; Temperatures</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31xOavXlLgL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31xOavXlLgL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41O0rz5i1XL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41pSxhl3EeL.jpg" noproxy>