100 sq. ft. 9000 Series Cartridge for Pleatco PWW100 ZEL Filter, replacement of Unicel C-9402, Pleatco PWW100-4 Media Area 100 sq ft, 9 15/16" OD, Open Hole: 5 13/16" Top, Open Hole: 6 1/16" Bottom, 19 5/16" Long, AK-8000 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 100 sq. ft. 9000 Series Cartridge for Pleatco PWW100 ZEL Filter, replacement of Unicel C-9402, Pleatco PWW100-4 Baleen Filters Top: Open Hole: 5 13/16" Bottom: Open Hole: 6 1/16" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures