Unicel Replacement Filter Cartridge for Swimming Pool Filter Unicel # C4401; Quantity: 2<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 4 15/16-inch; length: 4 5/8-inch</li><li>Top end cap: open， 2-1/8-inch inner diameter; bottom end cap: open， 2-1/8-inch inner diameter</li><li>Pleat count: 158; filter media: 4-ounce reemay 2040; filter area: 35 square feet</li><li>Get more efficient filtration and better water clarity with Unicel filters</li><li>Longer time between cleanings; meets oem specifications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Y3OBK1DGL.jpg" noproxy>