Aqua Kleen AK-6002 Unicel Replacement Filter Cartridge for Swimming Pool and Spa 100 sq. ft., 7 1/4" OD, 2 15/16" with Step Top, 2 15/16" with Step Bottom, 21 5/8" Long, AK-6002 Exact Fit for Unicel: C-7302 Exact Fit for Pleatco: POX100 Exact Fit for Filbur: FC-6320 Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures