I got this to keep my puppy from "bucket diving" and paddling all the water out onto the floor. The instructions for installation are not very clear - the photos or drawings could be more detailed. I did figure out how to mount the bottle and then the puppy figured out how to use it. A little patience is required when you first fill it - it drips until a vacuum is formed - but overall, it's a helpful item. I do have to find a brush that will clean it inside since the mouth is small and the inside is shaped irregularly.