Unicel FG-3016 Replacement Filter Grid for Sta-rite System 3 Models S7D75 and S8D110, Swimquip, Center Port Diameter: not available; length: 18-inch; width: 16 1/2-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: not available Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications