50 sq. ft. Pool Filter Replaces Unicel C-4950, C-4950-2, Pleatco PRB50-IN, Filbur FC-2390-Pool and Spa Filter Cartridges Media Area 50 sq ft, 4 15/16" OD, Open Hole: 2 1/8" Top, Open Hole: 2 1/8" Bottom, 13 5/16" Long, AK-3049 Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 50 sq. ft. In-Line Filter for Coleman 3301-2145, Pentair R173434, Rainbow 17-2380, Sundance 6540-471, Waterway 817-5000, Dynamic Series IV DFM, DFML, Dynamic Series I Model RDC, Dynamic Series II RTL/RCF, Dynamic Series III RTL/RCF, Jacuzzi J200 Pleatco. 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