This rain nozzle is meant to be placed on top of a screen cage. It is believed by some that dew lapping animals like chameleons and geckos get stimulated to drink by falling drops of water. This adjustable dome-less rain nozzle will do just that without adding extra bulk to the top of your enclosure. You can adjust the height of the arch by simply trimming the tubing in the arch. This will give you the ability to control how large your rain spot should be.