Unicel SC3-SR70 Replacement Filter Cartridge for 72 Square Foot Sta-rite 70TX, 70GPM-TX, 70TXR, T-70TX, T-70TXR, PTM70 Diameter: 8 11/16-inch; length: 18 3/16-inch Top end cap: open, 4-3/16-inch inner diameter; bottom end cap: open with 12 concentric slots, 4-3/16-inch inner diameter Pleat count: 195; filter media: 3-ounce reemay 2033; filter area: 72 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications