Pool Filter 4-Pack, Replaces Unicel C-7490, Pleatco PA137, Filbur FC-1297 Filter Cartridge for Swimming Pool and Spa Replacement Filter Cartridge for Unicel C-7490-4, Filbur FC-1297 and Pleatco PA137 Replaces Pleatco PA137 Replaces Filbur FC-1297