Akron Brass StreamMaster II [3481] Manual Fire Monitor System 2000 GPM (7600 LPM). The StreamMaster II manual monitor is taking monitor design technology to the next level. Included in its patented design is a unique waterway construction capable of flows from 250 gpm (950 lpm) up to 1250 gpm (4800 lpm). For the 3483 or 500-2000 gpm (1900-7600 lpm) for the 3481. This waterway provides balanced forces on the outlet and reduced friction loss resulting in exceptional stream performance over this wide-range of flows in a small compact package. This dual handwheel controlled monitor is suited for large flow needs in fire apparatus and fixed site installations.