A vertical multistage pump is a centrifugal pump containing two or more impellers. The fluid flows into the inlet of the pump casing where it flows into the eye of the impeller. The rotation of the impeller creates centrifugal force The diffusers are a type of cutwater which direct the fluid into the suction eye of the next impeller. This process continues until the fluid has passed through each impeller stage. The fluid is then directed out the pump casing through a final diffuser and into the pump discharge. Each stage that the fluid passes through increases the discharge pressure. Multistage pumps are used when higher pressures are required which single stage pumps of the same size are unable to attain. Vertical Multistage pumps are installed in applications where higher pressures are required including industrial, commercial, medical, industrial, high-rise buildings, municipal water supply. Its also used in Booster system as well as Boiler feed water transport.