PA81 Pool Filter Replaces Hayward C580E, CX580XRE, Ultral-A3, Unicel C-7483, Hayward SwimClear C3020, C3025, C3030, Filbur FC-1225, FC-6425,4 X 81 sq. ft. Filter Cartridge,L x OD: 19 5/8"x 7"4 Pack