Unicel FG-1003 Replacement Filter Grid for American, Hayward, Pac-fab, Sta-rite, Astral, Waterway, Jacuzzi Diameter: not available; length: 18-inch; width: 11-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