This Replacement filter cartridge replaces Unicel # C-4603, Pleatco # PHP11 and Filbur # FC-3756 and complies with OEM # 1370012 specifications. This 10 7/8 inch long and 4 ¼ inch wide filter cartridge can handle the top load of 9 square foot and is best fit for Jacuzzi Leisure Products. With its 1 15/16 inch holes it provides you complete protection from sand and worms. Very easy to install this filter cartridge is made of high quality materials.