Grundfos Pressure Booster Pump is a device that increases the pressure of a fluid. They can be used with liquids or gases, but the details of construction will differ depending on the fluid. A gas booster is similar to a gas compressor, but it is a simpler mechanism that usually has only one stage of compression and is used to raise the pressure of a gas that is already higher than atmospheric pressure. There are also two-stage boosters available. Boosters pump can be used to boost gas pressure, transfer high-pressure gas, charge gas cylinders, and scavenge.