The C370 is based on the compact C350 and brings forth the best features of its predecessor while adding a balanced valve to its design. An enhanced exhaust tee contributes to better work of breathing (a 10% improvement over the C350). A Compact Hi- Flow mouthpiece has been added to increase both airflow and mouth comfort. The C370 includes a user- adjustable inhalation effort control knob along with a small coaxial dive/pre-dive lever. The air balanced C370 is lightweight, breathes easy, offers full user controls and delivers effortless airflow.