Measurements: Length: 4" Outside Diameter: 4 -1/4" ( 4 1/4") Top Opening: 2 - 1/16"(2 1/16") Bottom Opening: 2 - 1/16" (2 1/16") SQ FT Media - 10' Free Flow Core Popular brand part numbers: Unicel - C-4310 (C4310) Filbur - FC-3077 (FC3077) Pleatco - PWW-10 (PWW10) Also replaces the following filters: Accent Spas Arctic Spas Blue Falls Mfg. Ltd. Charisma Spas Custom Molded Products Cyanna Valley Spas Diamante Spas Endless Pools Hollibaugh Spas Icon Spas Image Spas Keyes Spas Leisure Bay Spas Leisure Manufacturing Pdc Spas Rec Warehouse Sonoma Spas Superior Spas US Tooling & Spas Waterway Plastics Weslo Alternative filter names: CX200-RE, C-4620, FC-0645, C-200RE, Hayward C-200, Hayward MicroStar-Clear, American Commander II, 17-175-1035, 17-175-1308, PA20, PA 20 Manufacturer of this cartridge: Guardian Filtration Products (USA) Part number: 404-216 Feel Free to call 724.646.0450 pricing on: Large quantity discount Other cartridge sizes