This Replacement filter cartridge is replaces Unicel # C-4324, Pleatco # PGS25 and Filbur # FC-0187 while complies with OEM # PTL 20HS. With its 9 ¾ inch length and 4 5/8 inch width it can handle the top load of 25 square foot and is most suitable for Pleatco Skim Filter, Spa Manufactures, Jacuzzi Spa Division/Jacuzzi Bra, Down east spas, Echo series, Quantum Spas, Blue Ridge, Gatsby Spas, Master Spas, Ft wayne spas. It has molded cone handle on its top while 1 9/10 inch open hole at the bottom. By installing it you get clean and clear water free from germs and sands in your pools and spas.