There are three main types of overfill protection devices. Which one of the following is not an overfill protection device?

• A. Automatic shutoff device
• B. Overfill indicator
• C. Check valve
• D. Spill bucket

Answer: (D)

Preventing overfill during tank filling relies on devices that actively stop or alert you as the tank reaches capacity. An automatic shutoff device is built into the fill line to halt flow when the tank is full. An overfill indicator provides a clear signal (like a gauge or alarm) that it’s time to stop filling. A check valve helps control the flow direction and prevents backflow, which can reduce the risk of siphoning and unintended overfill. A spill bucket, on the other hand, is a containment feature that catches any spills that occur during filling but does not stop or signal the filling process itself. It addresses spilled product after the fact rather than actively preventing overfill. That’s why it’s not considered an overfill protection device.