Unicel C9415 Replacement Pool Filter Cartridge 150 Square Foot Predator C-9415 Diameter: 10 1/16-inch; length: 31 1/8-inch Top end cap: open, 6 0/0-inch inner diameter; bottom end cap: open, 6 0/0-inch inner diameter Pleat count: 175; filter media: 4-ounce reemay 2040; filter area: 150 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications