The 3M™ Versaflo™ Breathing Tube BT-30 features a self-adjusting length for improved fit and reduces risk of catching or snagging. A breathing tube connecting the air source with the headtop is required to ensure that clean air reaches the headtop reliably and with unrestricted airflow. The breathing tubes offered are compatible with all 3M™ Versaflo™ Headtops and Air Delivery Units