spray gun 
noun
A device resembling a gun which is used to spray a liquid such as paint or pesticide under pressure.As an old meatworker, I think I could do a better job than that, with a bit of masking paint and a spray gun....
- The detail of one drop station is displayed showing a manual spray gun with connecting fittings and hoses, fluid control, mini-filter, fluid quick disconnect and stem.
- The white background functioned like a witty surrogate for the gallery wall, and the brush reintroduced the intimacy of human touch that had been obliterated by the mechanized spray gun.