This Replacement filter cartridge replaces Unicel # C-4604, Pleatco # PHP 18 and Filbur # FC-3758 and complies with OEM # 1370031 specifications. This 17 7/8 inch long and 4 ¼ inch wide filter cartridge has 1 15/16 inch holes both at the top as well as bottom. It can bear the top load of 15 square foot and is bet fit for Jacuzzi Leisure Products. Made of high grade materials it is very easy to install.