According to NFPA 20 a ________ refill valve shall be used for each water supply tank used for fire protection.

According to NFPA 20 a ________ refill valve shall be used for each water supply tank used for fire protection.

• A. Manual
• B. Automatic
• C. Manual and automatic
• D. Both manual and automatic processes?

Answer: (C)

The key idea is that the water supply tank for fire protection must be replenished reliably under all conditions, which requires both automatic and manual control. An automatic refill capability ensures the tank is replenished whenever water is drawn from the system, maintaining readiness and preventing a drop in pressure or pump priming. At the same time, a manual operating option is essential for filling the tank during maintenance, testing, or if the automatic mechanism isn’t functioning. This dual capability—automatic refill with a manual override—provides reliable, controllable refilling for every water supply tank used in fire protection. That's why the best choice is a refill valve that is both manual and automatic.

The key idea is that the water supply tank for fire protection must be replenished reliably under all conditions, which requires both automatic and manual control. An automatic refill capability ensures the tank is replenished whenever water is drawn from the system, maintaining readiness and preventing a drop in pressure or pump priming. At the same time, a manual operating option is essential for filling the tank during maintenance, testing, or if the automatic mechanism isn’t functioning. This dual capability—automatic refill with a manual override—provides reliable, controllable refilling for every water supply tank used in fire protection. That's why the best choice is a refill valve that is both manual and automatic.