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 for use with the TR-6110E and TR-6130E filters. 3M recommends the use of the filter cover in order to help protect the TR-6110E from physical damage. It is also used to hold the TR-6600 Prefilter or TR-662 Spark Arrestor in place. The TR-6100FC should be replaced when damaged. The filter cover may be cleaned and reused.