This Replacement filter cartridge replaces Unicel # C-4351, Pleatco # PIC50N and Filbur # FC-0184 and meets OEM # 179192 specifications. This 23 ¾ inch long and 4 ¼ inch wide filter cartridge is capable of handling the top load of 50 square foot and is best fit for Icon Spas, Image Spas, Weslo Spas. With semi circular handle on its top and 2 5/16 inch open hole at bottom provides you complete protection from sand and germs. By installing this filter cartridge you get clean and clear water for your spas. Very easy to install this filter cartridge is made of high grade materials.