This Replacement filter cartridge has technical specifications as Unicel # C-4610, Pleatco # PSR15-4, Filbur # FC-2510 and OEM # C4610. This 9 ¾ inch long and 4 ½ inch wide replacement filter is the best fit for Sta-Rite TX-15. It is made of high quality materials and has 1 1/16 inch open holes both at the top and well bottom. By installing this filter you complete protection from germs and sand in your pool and spas.