Akron Brass StreamMaster [3578]  3 1/2" NH Electric Monitor. The StreamMaster Electric Fire Fighting Monitor has uniquely designed, low profile 4'' waterway with cast-in turning vanes. When coupled with an 80 psi nozzle, the pump can operate at lower pressures for flows up to 2000 gpm (7600 lpm). The StreamMaster brand is also available in a brass monitor construction.