Baleen Filters 50 sq. ft. Pool Filter Replaces Unicel C-4349, Pleatco PAE50, Filbur FC-6310-Pool and Spa Filter Cartridges Model: AK-3021 Media Area 50 sq ft, 4 15/16" OD, Open Hole: 2 1/8" Top, Open Hole: 2 1/8" Bottom, 17 3/8" Long, AK-3021 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. Top Load Filter for Advantage ELE-50 Cartridge, replacement of Unicel C-4349, Pleatco PAE50 Baleen Filters Top: Open Hole: 2 1/8" Bottom: Open Hole: 2 1/8" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures