Protects your 3M Versaflo TR-6110E and TR-6130E Filters 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, Enables turbo to be worn through decontamination showers, Filter cover may be cleaned and reused.