convenient ready-to-use kit; TR-819E kit includes intrinsically safe motor/blower (TR-802E), intrinsically safe battery (TR-830), battery attachment tool (TR-838), airflow indicator (TR-971), easy cleaning strip (TR -627), adjustable length breathing tube (BT-30), A2P filter (TR-6310E), filter cover (TR-6300FC), pre-filters (TR-6600) and single station battery charger (TR-641E); approved for use with a wide range of Versaflo™ S-Series Soft Headpieces and M-Series Hard Headpieces