A pressure sprayer is a chamber filled with a liquid, which can be lubricants, paints, or chemicals, and then filled with compressed air to spray the liquid under pressure. Units are usually designed in cast iron or stainless steel. Cast iron is used for lubricating liquids and some herbicides, and stainless steel is used for spraying water-based cleaners to ensure the water doesn't discolor from corrosion and pumped chemicals. Such equipment must not use flammable liquids.

The unit can be attached using a bracket that includes a partial design, or it can be attached to wheels for easy portability. A pressure sprayer consists of a tank, a safety valve, an inlet nozzle, and a gauge. They are filled with liquid first, and although the tank maybe 10 liters or more, they are only filled to 3/4 of the tank's capacity.

The nebulizer is then sealed and the airline connected to the container is pressurized to anywhere between 8-10 bar of its design pressure. Safety valves act above the design pressure to prevent overpressurization of the vessel. The unit comes complete with a spray gun, hose, and trigger, which allows the pressurized contents to be expelled through the nozzle and spray gun once the trigger is activated.