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。