SINGLE PACK FILTER MADE IN THE USA NEW IN FACTORY PACKAGING Popular Brand Replacement: Pleatco: PSD125U Unicel: C-8325 Filbur: FC-2790 Dimensions: Diameter: 8 1/2" Length: 17 3/4" Top: Multi-level Castle Bottom: Open Hole: 2 1/2" Filter Area: 125 sq ft Filter Material: Reemay (3 oz/yard) Alternate Filter Names: 6540-490 17-175-3225 2807-RS PSD125 UNIVERSAL Used in pools / spas made by: Sundance Spas and other manufacturers