Which device prevents water from freezing between the lower check valve and the Fire Department Connection?

The device that prevents water from freezing between the lower check valve and the Fire Department Connection is an automatic ball drip valve. This valve is specifically designed to allow any trapped water to drain out and prevent the buildup of water in areas where freezing could occur. By doing so, it helps to avoid potential damage to the fire suppression system and ensures that the system remains operable in cold weather conditions.

The automatic ball drip valve operates by utilizing gravity to expel water that may accumulate due to condensation or other factors. When the system is not pressurized, the valve opens to release water, thereby minimizing the risk of freezing in the connected pipes. This is particularly crucial in areas where temperatures can drop significantly.

Other options, while important in different contexts, do not serve the specific function of preventing freezing in this manner. For example, a freeze protection valve is intended to maintain system operational integrity in cold temperatures but doesn't specifically address the drainage of water that could freeze in a localized area. Understanding these distinctions highlights the critical role of the automatic ball drip valve in maintaining the functionality of fire protection systems in cold climates.