Unicel C-9485 Replacement Filter Cartridge for 85 Square Foot Hayward CX850RE Diameter: 9 1/4-inch; length: 14 3/16-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: 142; filter media: 4-ounce reemay 2040; filter area: 85 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications