Spray tips or nozzle usually come with airless texture sprayers, and the needles are associated with HVLP and traditional compressor guns.
Why are they necessary? Different paints can come with different thickness. Depending on the viscosity, you might need different nozzles for thinner and thicker paints. This way, the paint flows correctly and effortlessly.
Since the nozzle diameter or hole-size cannot be adjusted for airless paint guns, you need just the right size for every job