This Replacement filter cartridge complies with the technical specifications as Unicel # C-8326, Pleatco # PSD125-2000 and Filbur # FC-2780. This 19 inch long and 8 7/16 inch wide filter cartridge has Male Slip Fitting of 1 ½ inch at its top while Open w/Beveled Edge of 2 ½ inch at its bottom. It is capable of handing the top load of 125 square foot while is the most suitable for Sundance Spas. By installing this filter cartridge you gets clean and clear water complete protection from dust, sand and worms for your spas.