Unicel C-7483 Replacement Filter Cartridge for 81 Square Foot Hayward Cx580xre Diameter: 7-inch; length: 19 5/8-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: 176; filter media: 4-ounce reemay 2040; filter area: 81 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications