Weird Plumbing Valve

Digital ImageHere are shots of some odd little plastic vials with removable caps that are stuck into the wall underneath a pedestal sink and a toilet.  I have seen these before under pedestal sinks, but today was the first time to see one behind a toilet.  


I have no clue what purpose they serve, and have not been able to find anyone who knows, either.


All  I can say is, boy, they sure make it difficult to get the wallpaper to lie nicely against the wall, and to trim it neatly around the little gizmo. Digital Image

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