What type of nozzle is found on the hose line with the highest GPM on the officer side outside rear discharge?

The correct answer identified is the breakaway smooth bore nozzle. This type of nozzle is specifically designed to deliver a high volume of water efficiently and effectively, making it ideal for situations that require a high gallons per minute (GPM) output.

Smooth bore nozzles operate by allowing water to flow through a straight opening, which minimizes turbulence and maximizes discharge velocity. This design is particularly beneficial during high-demand firefighting scenarios, as it delivers a powerful stream that can penetrate flames and reach deep into fire-affected areas.

In contrast, combination nozzles, adjustable nozzles, and variable nozzles often incorporate features that allow firefighters to modify the pattern and flow of water. While these nozzles can be versatile and allow for different applications, they typically do not achieve the same high GPM levels that a breakaway smooth bore nozzle can deliver, especially in straightforward suppression tactics requiring maximum water flow.