Protects your 3M� Versaflo� TR-6580E filter from physical damage, Holds a 3M� Versaflo� Spark Arrestor, TR-662 or 3M� Versaflo� Prefilter (TR-6600) in place for further protection, Enables 3M� Versaflo� Power Air Turbo to be worn through decontamination showers, Filter cover may be cleaned and reused