A majority of the centrifugal pumps are horizontal end suction pumps and they are also called as overhung pumps. The name end suction stems from the fact that the suction flange is located at the eye or the center of the impeller. Discharge in pumps usually comes from the top of the pump, but on some end suction pumps, the user may rotate the discharge nozzle to any position. In these pumps, the impeller is attached to the end of a horizontal shaft supported by two radial bearings. These pumps are called overhung because the impeller is not between these two bearings but at the end of the shaft. Horizontal end suction pumps seldom have more than one impeller, which means they are single staged. The main advantage of these pumps is the capacity range, which is very high then the other pumps.