Which of the following is essential for connecting fire hoses to the system?

Connecting fire hoses to the system requires the proper components that ensure a secure and effective flow of water. Outlets play a critical role in this process. They are specifically designed points on a fire hydrant, pump, or other water supply systems where hoses can be connected directly for water flow. These outlets often have standard fittings that match the hoses used in firefighting, allowing for a reliable connection.

In contrast, other components such as threads would refer to the type of fastening mechanism on hoses and fittings, while adapters serve as intermediary devices that may join hoses of different sizes or types, and valves control the flow and pressure of water in the system. While all these components play important roles in a firefighting system, outlets are essential for the direct connection to the water source, making them indispensable for the task at hand.