Unicel C-7626 Replacement Filter Cartridge for 25 Square Foot Hayward CX250RE Diameter: 7-inch; length: 9 13/16-inch Top end cap: open with molded gasket, 3 0/0-inch inner diameter; bottom end cap: open with molded gasket, 3 0/0-inch inner diameter Pleat count: 111; filter media: 4-ounce reemay 2040; filter area: 25 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications