Jet 708732 AFS-1B-WOF Washable Electrostatic Outer Filter for 708620B AFS-1000B Air Filtration System Ideal washable filter for when a durable, washable and long-lasting filter is needed Suitable for many wash-and-use cycles Durable filter material that cleans easily with water Compatible with the 708620B AFS-1000B air filtration system Includes AFS-1B-WOF electrostatic filter