This replacement filter cartridge replaces Unicel # C-4616, Pleatco # PC16 and Filbur # FC-3735 and meets OEM # PC-16 specifications. This 16 inch long and 4 ¾ inch wide filter cartridge is the best fit for Coleco F-750,F-775,F-850,F-875,DR-16. By adopting this filter cartridge you get clean and clear water free from germs and sands in your pools and spas. This high quality replacement filter cartridge has 1 ¼ inch open hole at its top while 2 7/16 inch open hole at the bottom. Very easy to install this filter cartridge is made of superior grade of materials.