What is the purpose of overfill prevention devices other than alarms?

Overfill prevention devices play a crucial role in ensuring the safe operation of underground storage tanks by stopping or limiting the flow of product into the tank once it reaches a predetermined capacity. This function is essential because overfilling can lead to spillage, which poses environmental hazards and potential violations of regulatory requirements.

These devices are designed to engage either automatically or manually, reducing the risk of tank overfill situations that could otherwise result in leaks or groundwater contamination. By effectively managing the inflow of product, these devices help maintain safety and compliance with environmental standards, which is an important aspect of operating underground storage tanks in New York State and elsewhere.

While other options imply functions that may be relevant to tank management or operations, they do not directly pertain to the primary purpose of overfill prevention devices. Monitoring temperatures or enhancing product flow does not address the critical need to prevent overfill and its associated risks. Similarly, alerting environmental agencies does not reflect the direct operational intent of these devices. Therefore, the option that states that these devices stop or limit the flow of product accurately captures their essential purpose.