Unicel C-4301 Replacement Filter Cartridge for 27.5 Square Foot Martec， Sonfarrel<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 4 15/16-inch; length: 14 7/8-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: 106; filter media: 3-ounce reemay 2033; filter area: 27.5 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/31Yz5rfEChL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31o8QI5vDhL.jpg" noproxy>