This Replacement filter has the technical specifications as Unicel # C-4313 and OEM # WM-3779 and it can bear the top load of 2.5 square foot. This 3 ¾ inch long and 4 ¼ inch wide replacement filter is most suitable for Aqua Leisure, The Wet Set, Simple Set, Intex Recreation Type D. With its 2 1/16 inch hole both at the top as well as bottom, this filter cartridge provides you complete protection from dust, sand and worms. Very easy to install this filter cartridge is made of high quality materials.