Abstract: A rectangular compartment for receiving and dispensing pressurized gas cylinders. The compartment, for its use, requires a minimal space both inside and outside the compartment. The compartment contains a tank receiving unit configured to receive multiple tanks arranged in files. The tank receiving unit is pivoted near its center of mass so as to permit easy rotation in place of the tank receiving unit. The compartment is provided with an access door. When the access door is open and the tank receiving unit is rotated outward to receive tanks, the tank receivers in a file project a short distance outside the compartment and are arranged one above the other. When the access door is closed, the tanks are in an upright position and secured in that position by an interlock between the tank receiving unit and the access door.