Abstract: An air and water/soap concentrate mixing device which creates high quality compressed air foam without restricting the flow of liquid through the apparatus. The device consists of three water/soap concentrate chambers, an air manifold and a central air diffuser tube. Water/soap concentrate flow is increased through the device from the entry chamber (first) thru the acceleration (second) chambers. Upon entering the deceleration (third) chamber, the water/soap concentrate perimeter is laced with pressurized air from the air manifold wrapping the acceleration chamber. At the same time, pressurized air is also diffused and embedded in the center of the water/soap concentrate flow via the air diffuser tube. As the accelerated water/soap concentrate enters the deceleration chamber, the flow is dramatically decreased.