This Replacement filter cartridge has the technical specifications as Unicel # C-4403, Pleatco # PCP20, Filbur # FC-3073 and OEM # C4403. This 11 5/8 inch long and 4 5/8 inch wide filter cartridge is able to handle the top load of 25 square foot and best fit for Nemco. This high quality filter cartridge has molded cone handle at its top while 1 3/8 inch open hole at the bottom. By installing this filter cartridge you get clean and clear water free from sand and germs.