Holding the nozzles above the pump discharge during testing serves to discharge which of the following?

• A. Water
• B. Foam Concentrate
• C. All Air in the Hose
• D. Sediment

Answer: (C)

Purging air from the discharge hose is the purpose. When you hold the nozzle above the pump discharge, water pressure and gravity push any trapped air up and out through the nozzle. This vents the air and fills the hose with water, so the test measures true flow and pressure without air pockets causing cavitation or false readings. It isn’t about discharging water on purpose, and foam concentrate or sediment aren’t the primary factor during a standard discharge test—the goal is to remove the air in the hose so the line is fully primed with water.