What device should be used to prevent overfilling of propane containers?

The use of overfilling prevention devices is essential for ensuring the safe operation of propane containers. These devices are specifically designed to stop the inflow of propane into a container when it reaches a certain fill level, thus preventing the risk of overfilling. Overfilling can lead to dangerous situations, such as leaks or ruptures due to increased pressure, particularly in high temperatures where propane expands.

While pressure relief valves play a critical role in venting excess pressure, and emergency shut-off valves are vital for quickly stopping gas flow in hazardous situations, they do not directly address the issue of preventing overfilling during the filling process. Regular maintenance checks are important for overall safety and functionality of equipment, but they do not actively prevent overfilling during the actual filling of containers. Therefore, specifically utilizing overfilling prevention devices is the most direct and effective solution for avoiding this safety hazard.