Flexible Impeller Seawater pump is the measuring pump using the centrifugal force and makes the vacuum condition pulling the fluid into the pump with the help of methods of rotation of the wings of the Flexible impeller on cam. The operational principal is the method of pushing the fluid out through rotating and the being folded of the wings holding the fluid between the impeller wings. And pumping is possible in lower rpm and controlling the volume of the inlet adhering the Ball Valve to the inlet or the flux of the outlet controlling the rpm.