Which foam delivery device is described as self-educting and is used as a foam delivery option in around-the-pump systems?

• A. Self-educting nozzle
• B. In-line foam eductor
• C. Venturi injector
• D. Foam concentrate tank

Answer: (A)

In around-the-pump foam delivery, you want a device that automatically pulls foam concentrate into the water stream as it exits the pump. A self-educting nozzle does exactly this: it contains an internal mechanism that uses the velocity and pressure of the water to draw foam concentrate from its supply and mix it into the stream right at the nozzle. This allows you to deploy foam through the handline without needing a separate eductor in the hose line, making setup quicker and keeping foam and water proportions consistent at the point of discharge.

Other options rely on separate eduction devices or containers outside the nozzle—an inline foam eductor or a Venturi injector require additional components and plumbing, while a foam concentrate tank alone cannot deliver foam without an eduction device.