This lot of 3 Drive Medical Oxygen Tank Regulators is a great addition to your medical equipment. These regulators have a Barb Outlet and can handle a maximum pressure of 3000 PSI. The easy-to-read gauge on the regulator allows you to monitor the pressure level of the oxygen tank. These regulators are compatible with oxygen tanks and can be used for medical purposes. The item is sold as used and has been tested for functionality.