What is the difference between a gated wye and a water thief?

A gated wye and a water thief are both used in firefighting for managing water supply, but they serve different functions based on their design and application. The correct distinction lies in the addition of a 2 ½" outlet in the case of a gated wye.

The gated wye has multiple outlets, including one that is typically sized at 2 ½ inches, which allows it to supply water to two lines while still being served by a single source. This is particularly useful in firefighting operations where multiple hoses are needed simultaneously without reducing the pressure or flow from the main supply. The capability of the gated wye to allow for this additional outlet enhances versatility during operations, which is a fundamental reason why this design is favored in certain situations.

In contrast, a water thief usually features smaller outlets, often designed primarily for supplying multiple smaller lines or for use in specific setups where a more minor water source distribution is needed. This fundamental difference in outlet size and configuration illustrates the unique applications of each fitting in firefighting scenarios. Thus, the 2 ½" outlet present in the gated wye is a key characteristic that distinguishes it from a water thief.