Unicel C-2302 Replacement Filter Cartridge for 14.5 Square Foot Rainbow-hi Flow Diameter: 2 7/8-inch; length: 17 1/16-inch Top end cap: open, 1-1/16-inch inner diameter; bottom end cap: open, 1-1/16-inch inner diameter Pleat count: 84; filter media: 3-ounce reemay 2033; filter area: 14.5 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications