Length: 17-3/4"Diameter: 8-1/2"Top: Multi-level castleBottom opening: 2-1/2"   Built to meet OEM specifications, the Guardian 817-199 features: 125 sq. ft. of high-quality Filtration Fabric Exclusive Expansive Flow™ core Break-resistant Guardian banding Replaces popular brand part numbers: Unicel C- 8325 Filbur FC-2790 Pleatco PSD125U  Alternative filter names: 6540-490, 17-175-3225, 2807-RS, PSD125 UNIVERSAL Used in pools/spas made by: Sundance Spas & other manufacturers   By Guardian Filtration Products • 817-199