Pool Filter Replaces Unicel UHD-SR70, Pleatco PSR70-4, Filbur FC-2540 Filter Cartridge for Swimming Pool and Spa Media Area 72 sq ft, 8 11/16" OD, Open Hole: 4 3/16" Top, Open Hole: 4 3/16" Bottom, 18 3/16" Long, AK-8019 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 72 sq. ft. Sta-Rite Pro Filter, replacement of Unicel UHD-SR70, Pleatco PSR70-4 Baleen Filters Top: Open Hole: 4 3/16" Bottom: Open Hole: 4 3/16" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures Pre-Filters allow for quicker water balancing with fewer chemicals. Washing a filter will extend its life &amp; clean filters use less energy. The Jet Brush makes this quick and easy. Scum Magnets prevent scum andoil from making it to the filter for fewercleanings.