This replacement filter cartridge replace Unicel # C-5625, Pleatco # PJ25-IN-4, Filbur # FC-1425 and OEM # 42-2891-08-R as other specification. This 13 inch long and 5 inch wide filter cartridge has two 2 3/8 inch holes on it top as well as at bottom. It handles the top load of 25 sq ft and best fit for Cantar, Atlantic Pool Products (Canada), Seven Seas Spas, Competition Pool Products, Emerald Spas, Blue Ridge, Sundance Spas. This great quality filter cartridge is very easy to replace without any obstacle.