Akron Brass Akromatic 1250 [5177] 2 1/2" (65mm) Electric Master Stream Nozzle. The Akromatic 1250 electric master stream nozzle is designed for flows from 250 to 1250 gpm (950-4800 lpm) that have an 80 psi (5.5 bar) operating pressure. With this nozzle, you can take advantage of features including manual override, electric pattern control, pyrolite construction, and more. If you’re interested in learning more about master stream nozzles like this one, find an Akron Brass distributor near you today.