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- Perfectly Fit: PRB25-IN Spa Filter Cartridge Replacement for Pleatco PRB25-IN/Unicel C-4326/Filbur FC-2375, Filbur FC-2370/8172500/SD-00196/303909/M-4326/R173429, it is designed to fit Jacuzzi J200 Series Spas. Length:13-5/16", Outside Diameter:4-15/16", Top:2-1/8" open, Bottom:2-1/8" open, Filter Area: 25 sq. ft (Brand and model for compatibility reference only, this is not an OEM product, LVJUSEN is an independent brand)