Which device is used to split one line into two separate lines feeding different branches?

• A. Gate valve
• B. Wye fitting
• C. Siamese connection
• D. Gated wye

Answer: (D)

A device that splits one line into two feeding different branches needs a branching fitting, and the gated wye is exactly that with added control. A wye fitting in general divides flow into two separate paths, and the gate valve on one branch lets you shut off or regulate flow to that branch while keeping the other flowing. The Siamese connection, by contrast, is used to combine two lines into one, not split one line into two. A gate valve alone controls flow in a single line and doesn’t create a second branch. So the gated wye is the right choice because it both splits the line and provides independent control for each branch.