Baleen Filters 33 sq. ft. Pool Filter Replaces Unicel C-7633, Pleatco PPF33, Filbur FC-2120-Pool and Spa Filter Cartridges Model: AK-6077 Media Area 33 sq ft, 7" OD, Open Hole: 2 15/16" Top, Open Hole: 2 15/16" Bottom, 14" Long, AK-6077 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 33 sq. ft. 7000 Series Cartridge for Purex CF-33/100 Filter, replacement of Unicel C-7633, Pleatco PPF33 Baleen Filters Top: Open Hole: 2 15/16" Bottom: Open Hole: 2 15/16" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures