Unicel C-7496 Replacement Filter Cartridge for 105 Square Foot Purex CF-105/315 Diameter: 7-inch; length: 25 5/8-inch Top end cap: open, 2 15/16-inch inner diameter; bottom end cap: open, 2 15/16-inch inner diameter Pleat count: 172; filter media: 4-ounce reemay 2040; filter area: 105 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications