Which component of a fire department connection is used to connect two hoses to a single supply for the sprinkler system?

• A. Siamese Inlet
• B. 2-1/2 Inch Wye
• C. Water Thief
• D. Four-Way Valve

Answer: (A)

The Siamese inlet is designed to merge two attack lines into one supply for the sprinkler or standpipe system. It has two inlets that firefighters connect to their hose streams, and a single outlet that feeds the system, allowing both hoses to deliver water simultaneously and increase overall flow to the system. This setup is why two separate hoses can be combined into one powerful feed, which is exactly what’s needed for rapid, high-volume water delivery.

The other options fit different roles: a Wye splits one source into two branches, not two into one; a water thief is a device used to transfer water between sources in specific setups, not the standard two-hose-to-one-supply connector; and a four-way valve directs flow among multiple lines rather than combining two feeds into one.