You may be able to fix steel posts into the ground, but one of the real problems arises when the posts begin to fill up with water, which can damage the insides and cause them to malfunction. If the metal post is attached to a pet waste receptacle or a pet waste disposal sign, then this issue of water can cause some problems. That is where the Square Post Pyramid Rain Cap comes in as a solution that can be easily snapped on in seconds. This particular pyramid post rain cap measures 2 inches by 2 inches and fits onto the top of any post that also has these measurements. It easily clips on to ensure that no objects are squeezed inside, blocking it up and causing problems or any water.