Unicel FG-1236 Replacement Filter Grid for Purex Diameter: not available; length: 19-3/8-inch; width: 10-3/4-inch Top end cap: not available, 0-inch inner diameter; bottom end cap: not available, 0-inch inner diameter Pleat count: not available; filter media: not available; filter area: 36 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications