Abstract: A self-educting, high expansion, multi-agent nozzle of the type for educting more than one chemical and mixing these chemicals with a motive fluid stream within the nozzle and ejecting the mixed fluid stream is provided. The self-educting, high expansion, multi-agent nozzle including a body having an eductor section and a barrel section, the eductor section forming a vacuum chamber and a first and second chemical port adapted for connecting to a first and second chemical source respectively, the barrel section forming a pathway between an inlet from the eductor section to an open discharge end; a head forming a tapered conduit between an open motive fluid end adapted for connecting to a motive fluid source and an open exit end, the head connected to an open head end of the eductor section in a manner such that the exit end is disposed within the vacuum chamber; a barrel sleeve movably connected to an exterior surface of the barrel section; and a diffuser mounted within the pathway of the barrel section.