Baleen Filters AK-4028 Pool Filter Replaces Unicel C-5625, Pleatco PJ25-IN-4, Filbur FC-1425-Pool and Spa Filter Cartridges, 25 sq. ft. Media Area 25 sq ft, 5" OD, Open Hole: 2 3/8" Top, Open Hole: 2 3/8" Bottom, 13" Long, AK-4028 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. In-Line Filter for Jacuzzi CFR-25, Jacuzzi CFT-25, Caressa (pre-1986), Espree, Espree II, replacement of Unicel C-5625, Pleatco PJ25-IN-4 Baleen Filters Top: Open Hole: 2 3/8" Bottom: Open Hole: 2 3/8" 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.