A gated wye splits a single hose line into two separate lines, allowing firefighters to direct water to multiple locations from one source. This is especially useful when you need to manage water flow to different parts of the fireground using a single supply.

In contrast, an LDH Siamese with clapper combines two separate hose lines into a single large line. The clapper valves inside the Siamese prevent backflow, allowing water to flow in one direction and ensuring that only the line under pressure will contribute to the water flow. This makes the LDH Siamese ideal for efficiently merging water streams from different sources into a single line, providing a more concentrated water supply.

The clapper valves in an LDH Siamese ensure that water only flows in one direction and prevent backflow from uncharged lines. This feature allows one hose line to supply water while the second line is being set up or charged, making it possible to keep operations running smoothly without interruptions. This is particularly important when merging multiple water sources into a single line for more concentrated water flow.