What device draws foam concentrate from a storage container into a stream of water?

The device that draws foam concentrate from a storage container into a stream of water is known as an eductor. An eductor utilizes the Venturi principle, where the flow of water creates a vacuum effect that siphons the foam concentrate into the water stream. This is essential in fire suppression as it allows for the mixing of foam and water, enhancing the firefighting capabilities by creating a more effective fire extinguishing agent.

The eductor is particularly useful for producing foam in varying concentrations and can be adjusted based on the fire scenario and type of foam being used. It is a common tool in firefighting operations, especially when dealing with flammable liquids, as it improves the coverage and penetration of the foam.

While a foam nozzle disperses the foam mixture for application and can sometimes integrate foam concentrate capabilities, it doesn't draw foam from a tank itself. An injector is similar in function but specifically refers to a device that introduces a liquid into a flow, not necessarily foam concentrate. A foam sprayer is a general term that might refer to equipment used for applying foam but does not inherently denote the mechanism of drawing concentrate into the water stream. Thus, the eductor is the most appropriate answer, as it specifically describes the action of mixing foam concentrate with the water flow