Unicel C-8317 Replacement Filter Cartridge for 175 Square Foot Hayward Xstream CC1750RE Diameter: 8 15/16-inch; length: 23 5/16-inch Top end cap: open with molded gasket, 4 0/0-inch inner diameter; bottom end cap: open with molded gasket, 4 0/0-inch inner diameter Pleat count: 251; filter media: 3-ounce reemay 2033; filter area: 175 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications