Which type of foam proportioner is directly attached to the pump panel outlet or connected at some point in the hose lay?

• A. External eductor
• B. Venturi injector
• C. Induction foam mixer
• D. In-line eductor

Answer: (D)

The main idea is how the foam is mixed into the water flow. An in-line eductor is designed to sit directly in the discharge path, either attached to the pump panel outlet or placed somewhere along the hose lay. Because it sits in the flow, water going out of the pump automatically flows through the eductor, which draws foam concentrate into the stream at the chosen proportion and mixes it as it passes downstream. This inline placement makes the foam solution ready to discharge through the hose with a simple, integrated setup.

Other options are not described as being directly in the discharge path. An external eductor is mounted outside the immediate pump outlet on a separate line, requiring extra connections and routing. A venturi injector and an induction foam mixer are configurations that typically aren’t described as inline attachments right at the pump outlet or integrated into the hose lay in the same straightforward way, and they’re used in different system layouts.