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This photo shows the air pressure cap at work. As it exits the fluid tip, the paint is atomized by compressed air rushing out of a series of precision-machined passages in the pressure cap. The two horns on the pressure cap each contain a pair of air outlets. Those, combined with several smaller outlets in the face of the cap, influence the way the paint is atomized and the pattern it forms in the air. This spray pattern is referred to as the fan.