3M Powered & Supplied Air Breathing Tubes are part of a NIOSH-approved respiratory system3M Powered & Supplied Air Breathing Tubes connects the air source with the headtop and ensures clean air reaches the headtop reliably and with unrestricted airflow. 3M Powered & Supplied Air Breathing Tubes are compatible with with certain 3M(TM) Respiratory Headtops and Air Delivery Units.