What is a Siamese coupling, and when is it used?

What is a Siamese coupling, and when is it used?

• A. A Siamese coupling is used to connect three hoses to form a Y-shaped supply.
• B. A Siamese coupling connects two supply hoses to feed two separate lines.
• C. A Siamese coupling combines two hoses into a single larger-line feed, used to join two supply hoses to feed a single attack line or deck gun.
• D. A Siamese coupling is a valve that diverts water to two separate lines.

Answer: (C)

A Siamese coupling is a fitting that merges two supply hoses into one larger feed. It has two inlets and a single outlet, so it can combine water from two sources (like two hydrants or two supply lines) to feed one attack line or a deck gun. This setup increases the available flow to a single nozzle, which is useful when a single hose can’t supply enough volume. It’s different from fittings that split a line into two feeds—those are used to distribute water to multiple lines, not to combine them.

A Siamese coupling is a fitting that merges two supply hoses into one larger feed. It has two inlets and a single outlet, so it can combine water from two sources (like two hydrants or two supply lines) to feed one attack line or a deck gun. This setup increases the available flow to a single nozzle, which is useful when a single hose can’t supply enough volume. It’s different from fittings that split a line into two feeds—those are used to distribute water to multiple lines, not to combine them.