Nexus vertical multi-stage booster pump systems are designed for high pressure and/or high flow applications. They are particularly effective in delivering pressurized water to high-rise buildings, manufacturing complexes and other large facilities. Industrial and municipal plants benefit from booster pump sets for efficient delivery of fresh water and removal and treatment of wastewater. These vertical booster pumpsets can be regulated by a variable frequency drive that controls the pump operation to maintain constant pressure regardless of varying demand and fluctuation in incoming pressure. Pumps in the set operate in a synchronized manner to supply the specified flow and pressures.