Unicel C-7419 Replacement Filter Cartridge for 100 Square Foot Martec， Sonfarrel<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 7 1/2-inch; length: 21 7/8-inch</li><li>Top end cap: open， 2 15/16-inch inner diameter; bottom end cap: open， 2 15/16-inch inner diameter</li><li>Pleat count: 168; filter media: 4-ounce reemay 2040; filter area: 100 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/31DxLNDIpaL.jpg" noproxy>