Which of the following is NOT a type of overfill prevention device?

A pressure gauge is not a type of overfill prevention device. Overfill prevention devices are specifically designed to prevent the tank from exceeding its maximum capacity, thereby avoiding leaks and potential environmental hazards. A flow shut-off device automatically stops the flow of fuel when the tank reaches a predetermined level, while alarms alert operators to potential overfill situations. Vent-restriction devices help manage pressure within the tank to prevent overflow during filling.

In contrast, a pressure gauge simply measures the pressure within the tank and does not contribute to preventing overfilling. Its primary function is to provide information rather than actively prevent a condition related to overfilling.