Unicel C-7370 Replacement Filter Cartridge for 75 Square Foot Sundance Spas<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 7 1/2-inch; length: 17 3/4-inch</li><li>Top end cap: castle， 0-inch inner diameter; bottom end cap: open with beveled edge， 2-1/2-inch inner diameter</li><li>Pleat count: 154; filter media: 3-ounce reemay 2033; filter area: 75 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/41OeEg%2B5y1L.jpg" noproxy>