Baleen Filters Pool Filter Replaces Unicel # C-9405 (Pleatco # PAP50-4, Filbur # FC-0684) for Swimming Pool and Spa Media Area 50 sq ft, 10 1/16" OD, Open Hole: 6" Top, Open Hole: 6" Bottom, 8 9/16" Long, AK-8001 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 50 sq. ft. 9000 Series Cartridge for Clean & Clear, Dimension One, Endless, Predator Filter, replacement of Unicel C-9405, Pleatco PAP50-4 Baleen Filters Top: Open Hole: 6" Bottom: Open Hole: 6" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures