Unicel C-8412 Replacement Filter Cartridge for 120 Square Foot Hayward CX1200RE, Waterway Pro Clean 125, Waterway Clearwater II 125 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: 172; filter media: 4-ounce reemay 2040; filter area: 120 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications