For high-rise operations, if the building has a two-inlet FDC, what should the engineer attach to one of the inlets?

In high-rise operations, a two-inlet Fire Department Connection (FDC) is designed to enhance the firefighting capabilities by allowing multiple lines to be supplied to the building simultaneously. Attaching a clappered siamese connection to one of the inlets is crucial because it allows for two hoses to be connected and deployed at once while preventing backflow between the inlets. This setup maximizes flow and pressure for firefighting efforts, ensuring that both inlets can function effectively without interference.

The clapper mechanism ensures that water flows in only one direction, which is essential in high-rise scenarios where maintaining adequate pressure and flow is critical to combatting fires. This feature allows firefighters to efficiently manage water supply in challenging conditions typical of high-rise incidents.

Other options, such as a single connection or nonsiamese connection, do not provide the same level of operational effectiveness and flexibility needed in high-rise operations. A double hose connection, while useful, does not specifically address the need for clappered functionality in high-rise firefighting strategies, which is why the clappered siamese connection is the most suitable choice.