This Replacement filter cartridge has the technical specifications as Unicel # C-4608, Pleatco # PC8, Filbur # FC-3726 and OEM # C-4608. It is the most fit for Coleco F-110, CR-8, Cyclone Pool Vac and provides complete protection from germs and sand in your pools and spas. This 8 inch long and 4 ¾ inch wide filter cartridge has 1 ¼ inch open hole at its top and 2 7/16 inch hole at the bottom. Very easy to install this filter cartridge is made of high grade of materials which provides clean and clear water.