Unicel C-7494 Replacement Filter Cartridge for 131 Square Foot Hayward CX1280RE Diameter: 7-inch; length: 32 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: 169; filter media: 4-ounce reemay 2040; filter area: 131 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications