A booster pump is a device that increases the pressure of a fluid. They may be used with liquids or gases, and the construction will vary depending on the fluid. A gas booster is similar to a gas compressor, but generally a simpler mechanism which often has only a single stage of compression, and is used to increase pressure of a gas already above ambient pressure. Specifications. Height 0.75 in.. Width 0.85 in.. Length 0.8 in.