This CGA 540 Mini Oxygen Regulator from Drive Medical provides all of the functionality of the full size model. This oxygen regulator offers a multitude of liter flow options up to 8 liters per minute. The DISS Outlet will connect to a humidifier or an adapter is needed to connect directly with a cannula. An attractive green finish caps off the sleek design of this oxygen regulator. Drive regulators feature a protective contents gauge and a built-in pressure relief valve for safety|Mini regulators offer the same function as standard regulators while facilitating an easier fit into oxygen carry bags|Easy to operate single selector knob|Lightweight and durable design|Meets or exceeds accuracy standards for ASTM, American National, and CGA|Inlet Pressure: 300-3,000 PSI|Outlet pressure: 50 PSI|UL Approved