Unicel C-7330 Replacement Filter Cartridge for 30 Square Foot Micro Filter, 7-1/4-Inch OAL Diameter: 7-inch; length: 7 1/4-inch Top end cap: open, 4-1/8-inch inner diameter; bottom end cap: open, 4-1/8-inch inner diameter Pleat count: 265; filter media: 3-ounce reemay 2033; filter area: 30 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications