3M™ Versaflo™ Prefilter for TR-619E starter kit. It extend the service life of the particulate element of TR-600 series filters by capturing large particles that may otherwise clog the filter. It is installed and used according to the User Instructions. It may reduce operating costs by extending the life of TR-600 series filters. It can be used with TR-662 spark arrestor. It is maintenance free and should be discarded when clogged or damaged.