... high speed pump series, which are mainly composed of motor, gearbox, pump unit, lubrication system and baseplate. GSB-W series pumps feastures ... backflow stabilizer is installed in the GSB-W5/W7 pump unit, which improves the pump performance at the low flow ... high speed pump series, which are mainly composed of motor, gearbox, pump unit, lubrication system and baseplate. GSB-W series pumps feastures ...