Unicel S-0170 Replacement Filter Grid for 17-Inch Od by 2-1/2-Inch Hub Diameter: 17-inch; length: not available 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: not available Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications