What type of supply tank contains high-pressure gases that can exceed 2,000 psi gauge?

The most appropriate choice for a supply tank that contains high-pressure gases exceeding 2,000 psi gauge is a cylinder. Cylinders are specifically designed to hold gases under high pressure, and they are constructed from durable materials to safely contain these gases. The design standards for cylinders ensure they can endure pressures that significantly exceed typical atmospheric levels, which aligns with the requirement of containing gases over 2,000 psi.

The reference to a cylinder emphasizes its unique construction and features, such as a safety valve, which are crucial for handling high-pressure conditions. This makes it the correct choice in the context of high-pressure medical gas supply.

Other types of tanks, such as high-pressure supply tanks, pressure vessels, and storage cylinders, may also hold gases but don't specifically refer to the standard definition and application of cylinders in the context of high-pressure containment used in the medical gas industry, where precise definitions and applications are paramount.