Which of the following is NOT a component of a sprinkler system?

A sprinkler system is designed to suppress or extinguish fires using water, and it consists of several key components that work together to ensure its effectiveness. Water supply tanks provide the necessary water storage for the system, ensuring that there is enough water available during an emergency. Control valves are critical for managing the flow of water within the system, allowing for activation and maintenance. Alarm check valves serve to monitor the flow of water and provide indications of whether the system is functioning correctly in situations of alarm or potential activation.

Fire extinguishers, while essential in fire safety and emergency response, are not part of a sprinkler system. Instead, they serve as portable devices that individuals can use to combat small fires before they escalate. This distinction highlights how each component fulfills a different role in fire safety; therefore, the correct answer clarifies that fire extinguishers do not belong to the functional framework of a sprinkler system.