Unicel C-7458-4 Pool, Spa or Hot Tub Filter Cartridge, 4 Pack, White Diameter: 7-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: 171; filter media: 4-ounce reemay 2040; filter area: 56 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications