Unicel C-4605 Replacement Filter Cartridge for 8 Square Foot Muskin Fp A2027, Sears, Haugh Products Diameter: 4 5/16-inch; length: 8-inch Top end cap: open, 2-3/16-inch inner diameter; bottom end cap: open, 2-3/16-inch inner diameter Pleat count: 55; filter media: 4-ounce reemay 2040; filter area: 6 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications