This Click Style Regulator from AIRTECH offers a multitude of flow setting options 0-1 0-2 0-4 0-6 0-8 0-15 0-25 each. The Outlet will connect to a humidifier or an adapter is needed to connect directly with a cannula. Aluminum body with the brass core. Complies with CGA standard. Click oxygen regulators can be applied to various types of the O2 cylinder, with high quality and low repair rate.