Pool Filter Replaces Unicel C-4970, Pleatco PCAL75, Filbur FC-2930 Filter Cartridge for Swimming Pool and Spa Media Area 75 sq ft, 4 15/16" OD, Open Hole: 2 1/8" Top, Open Hole: 2 1/8" Bottom, 23 5/8" Long, AK-3050 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 75 sq. ft. Top Load In-Line Filter for Leisure Bay, Sunbelt, Waterway Plastics, replacement of Unicel C-4970, Pleatco PCAL75 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