Unicel 6CH-961 Replacement Filter Cartridge for 60 Square Foot Jacuzzi Premium Diameter: 6 3/4-inch; length: 15 1/2-inch Top end cap: open with slots, 0-inch inner diameter; bottom end cap: 2-inch sae thread, 0-inch inner diameter Pleat count: 131; filter media: 3-ounce reemay 2033; filter area: 60 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications