What should be done with the pump's transfer valve if using a two-stage pump?

When operating a two-stage pump, transferring the pump to Parallel/Volume is essential for optimal performance during certain firefighting scenarios. In this configuration, both stages of the pump work together to increase the volume of water being delivered, which is particularly useful when a high flow rate is necessary, such as when multiple hoselines are in operation or when supplying large volumes of water to operations.

Using the Parallel/Volume setting allows firefighters to maximize the pump's capacity to deliver water, ensuring effective firefighting efforts. It is important to understand when to switch between the Parallel and Series settings. The Series/Pressure setting is generally used for situations requiring high pressure at lower flow rates, such as when a single high-pressure hoseline is in use.

In summary, transferring the pump to Parallel/Volume enhances the water delivery capability of a two-stage pump when the situation demands increased flow, making it the correct choice.