Baleen Filters 30 sq. ft. Pool Filter Replaces Unicel 4CH-30, Pleatco PTL25H-P-4, Filbur FC-0141-Pool and Spa Filter Cartridges Model: AK-9005 Media Area 30 sq ft, 4 5/8" OD, molded cone handle Top, 1-1/2" MPT Bottom, 11 7/8" Long, AK-9005 Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 30 sq. ft. Top Load Filter for Freedom, Great Northern Eng., OpuSpas, Seascape, Spillway, replacement of Unicel 4CH-30, Pleatco PTL25H-P-4 Beleen Filters Top:molded cone handle Bottom: 1-1/2" MPT Guaranteed Perfect Fit - Extreamly Durable - Wash & reuse - Most Energy Efficient - Withstands High Pressures & Temperatures