This breathing tube is part of the 3M™ Air Regulating Valve Assembly W-3061 which allows the 3M™ Full Facepiece 7800S or the 3M™ Full Facepieces 6000DIN to be operated in airline mode. The breathing tube connects to the 3M™ Airline Adapter W-3187 in the center part of the facepiece.
3M™ 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.