Baleen Filters 75 sq. ft. Pool Filter Replaces Unicel C-8600, Pleatco PA80-4, Filbur FC-1280-Pool and Spa Filter Cartridges Model: AK-7009 Media Area 75 sq ft, 8 1/2" OD, Open Hole: 4 1/16" Top, Open Hole: 4 1/16" Bottom, 17 3/8" Long, AK-7009 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 75 sq. ft. 8000 Series Cartridge for Hayward Star-Clear ll C800, Star-Clear ll C1500, ARNESON & COMFORTZONE Filter, replacement of Unicel C-8600, Pleatco PA80-4 Baleen Filters Top: Open Hole: 4 1/16" Bottom: Open Hole: 4 1/16" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures