Abstract: Nozzle contained within tubular housing. An annular manifold concentrically surrounds and abuts the outside of the housing. The manifold communicates with an external source of water. A cylindrical transducer is located within the housing. A hollow cone having an exit opening formed by a truncated vertex and an open base forms the front of the nozzle. The face of the transducer which emits ultrasonic waves is situated adjacent to the base of the cone. An annular passageway concentrically surrounds the transducer. The passageway runs axially towards the front of the nozzle before turning radially inward towards the nozzle's centerline. The axial section of the passageway communicates with the manifold through radial ports. The section of the passageway that turns inward communicates with the base of the cone, and also directs flow of water so that its confluence is on the emitting face of the transducer. The water subsequently flows out the exit opening in a steady state column.