Akron Brass AkroFoam [4470] 2 1/2" NH (65 mm) Brass Master Stream Nozzle with Pickup Tube. The Akrofoam foam nozzles are self-educting master stream nozzles designed for educting foam at flow rates up to 1000 gpm (4800 lpm). Contact a distributor today to learn more about our master stream foam nozzles.