Which appliance connects two hoses into one and is equipped with clapper valves to allow the use of only one supply line at a time?

Which appliance connects two hoses into one and is equipped with clapper valves to allow the use of only one supply line at a time?

• A. Clapper valves
• B. Wye (Gated wye)
• C. Siamese
• D. Water thief

Answer: (C)

When you need to feed a single discharge from two separate hoses, you use a Siamese connection. It brings two inlets together into one outlet, and it’s equipped with clapper valves (check valves) that prevent backflow into the other hose. This setup lets water come from one supply when needed while keeping the other line isolated, and it also protects against cross-flow if both lines are pressurized or if one is shut down. The other options don’t fit as the device for this purpose. A Wye is designed to split flow from one source into two paths, not combine two sources into one. A water thief is a different adapter used to connect hoses but typically isn’t built with clapper valves to enforce single-line use. And clapper valves are components, not the complete appliance that merges two hoses into one.

When you need to feed a single discharge from two separate hoses, you use a Siamese connection. It brings two inlets together into one outlet, and it’s equipped with clapper valves (check valves) that prevent backflow into the other hose. This setup lets water come from one supply when needed while keeping the other line isolated, and it also protects against cross-flow if both lines are pressurized or if one is shut down.

The other options don’t fit as the device for this purpose. A Wye is designed to split flow from one source into two paths, not combine two sources into one. A water thief is a different adapter used to connect hoses but typically isn’t built with clapper valves to enforce single-line use. And clapper valves are components, not the complete appliance that merges two hoses into one.