Rb series of flexible shaft pumps are mini centrifugal pumps of single type; They are wi-dely used for pumping and draining in const-ruction building sites, tunnels, culverts, water reservoir, etc, also for wastewater discharging in industry, irrigation on farmland and so on, they are driven by diesel engines and gaso-line engines; Minitypes can also use vibrator motor as their power, they have the features that convenient to operate, large flow quantity and high delivery lift.