What is the key component of a fire department connection (FDC)?

The key component of a fire department connection (FDC) is a threaded connection for fire hoses to supply water during an emergency. This connection allows firefighting personnel to quickly and efficiently connect their hoses to the building's sprinkler system or standpipe, enabling them to deliver water directly into the system. This is crucial during a fire emergency, as it enhances the firefighting capability by providing an additional water source.

In contrast, while a valve that controls water flow is a necessary part of many systems, it is not the defining element of the FDC itself. A backup water tank can be a beneficial feature in certain fire protection scenarios but does not represent the core purpose of the FDC. Similarly, a monitoring system for sprinkler pressure is important for system integrity and operation but is separate from the primary function of the Fire Department Connection, which is to facilitate immediate water supply during emergencies.