Sta-Rite Posi-Flo 70 WC108-57S2X, Replacement Filter Cartridge, Aladdin 17201, Unicel UHD-SR70, Sta-Rite Posi-Flo 88PTM70, Pleatco PSR70 Filbur FC-2540 Swimming Pool Filter Cartridge PLEASE DOUBLE CHECK ... DOES YOUR CARTRIDGE MATCH THESE MEASUREMENTS ??? LENGTH: 18 3/16 inches ... OUTER DIAMETER: 8 11/16 inches ... INNER DIAMETER: 4 3/16 inches // 70 square feet ... 195 pleats Replacement Cartridge fits: Sta-Rite Posi-Flo 70, Unicel UHD-SR70, Pleatco PSR70 Aladdin 17201, OEM WC108-57S2X MADE IN THE USA!