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Made in the USA New in Factory Packaging Replaces the following: Unicel - C-4405 (C4405) Filbur - FC-2387 (FC2387) Pleatco - PRB25SF PR (PRB25SF-JH-PAIR) Rainbow DSF 50 (DSF-50) Ahtria Aqua Leisure Arizona Pacific Beachcomber (3005825) Beachcraft Spas Canspa Mfg. (Canada) Caribbean Spas Catalina Clearwater Spas DFA Diamante Spas Diamond Back Spas Discovery Spas Freedom Spas (Models dated after 1993) Grecian Spas Hytec Spas Legend Spas Lifestyle Spas (Canada) Marquis Spas (Replaces a single cartridge) Moose Mountain Spas (Canada) Pentair Pool Products (R173433) Rainbow Plastics (17-2464) Signature Spas Simple Set Starlight Spas Sundance Spas Sunrise Spas (Canada) Thermo Spas of Connecticut US Tooling & Spa Waterway Plastics (817-5010) Other Alternate Filter Names: FL1004, 46163, 6000-134 Large quantity discount Call or email for pricing