| If you are referring to what twelvepole mentioned, than it is neither special, nor expensive to add to an existing sprinkling system. You won't see them individually because they are very small and come in a kit. A kit will run you less than $30 for a bunch of hose, fittings, etc. If you are thinking of something else than it is hard to say, many things can be described as misty and foggy. Any extra detail you can provide would be helpful or better yet, a picture! |