Unicel C-7490 Replacement Filter Cartridge for 137 Square Foot Hayward CX1380RE 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: 176; filter media: 4-ounce reemay 2040; filter area: 137 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications