This Replacement filter cartridge complies with the Unicel # C-4315, Pleatco # PIC15 and Filbur # FC-0200 and meets OEM # PIC15 specifications. This 7 1/8 inch long and 4 ¼ inch wide filter cartridge has 2 inch open hole at the bottom while semi circular handle on its top. This filter cartridge is capable of handling the top load of 15 square foot and is best fit for Icon Spa, Weslo Spas. Very easy to install without any hassle this filter cartridge is made of good quality materials.