Salter Labs High Flow 350cc Bubble Humidifier is designed to support high oxygen flow rates with face masks or high flow cannulas. Marked minimum and maximum lines help easily identify optimum operation levels. Ideal for home, clinic or hospital oxygen therapy use, it handles between 6 - 15 liters per minute (LPM). The 360-degree diffuser head provides superior gas hydration with very low operation volume. The pressure relief valve automatically resets and also has an audible pressure relief alert to warn of any potential patient or equipment hazards. Low water turbulence and tight, large wing nut securely seals in pressure and prevents rain-out.