Pool Filter Replaces Unicel 6CH-25, Pleatco PTL20W-SV-P-4, Filbur FC-0305 Filter Cartridge for Swimming Pool and Spa Media Area 25 sq ft, 6" OD, Semi Circular Handle Top, Open Hole: 1 1/2 Bottom, 5 1/2" Long, AK-9011 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 25 sq. ft. Top Load Filter for Softub, Sunrise, replacement of Unicel 6CH-25, Pleatco PTL20W-SV-P-4 Baleen Filters Top: Semi Circular Handle Bottom: Open Hole: 1 1/2 Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures