This Replacement filter cartridge replaces Unicel # C-9415, Pleatco # PAP150-4, Filbur # FC-0687 and meets the OEM # R173216 specifications. This 31 1/8 inch long and 10 1/16 inch wide filter cartridge has 6 inch open holes both at top as well as bottom. It is the best fit filter cartridge for American Products, Pentair Pool Products Predator, Clean & Clear, Pentair Pool Products-Pac Fab Re, Pentair Pool Products-American P can capable of handling top load of 150 sq ft. It gives you complete protection from sand, dust and worms in you pools and spas. Very easy to install this filter cartridge is made of superior quality of materials.