The in-line eductor results in a substantial appliance pressure loss of approximately ______ psi

• A. 10-30 psi
• B. 70-90 psi
• C. 40-60 psi
• D. 60-70 psi

Answer: (B)

An inline eductor uses venturi suction to pull foam concentrate into the water stream, and that action creates a noticeable pressure drop in the pump discharge line. Because the eductor sits in line with the supply to the attack hose, the pump must overcome this extra loss in addition to normal friction losses to keep the nozzle at the desired pressure. That pressure hit is substantial, so it falls into the higher end of the typical ranges you see for this device. In practice, this means you need to pump enough extra discharge pressure to compensate, which is why the option describing a large pressure loss is the best fit.