Product review (5 stars): Works great w/ no leaks on TCL water cooler
Works great - a big step up from having to refill a filter pitcher 5+ times per day in the refrigerator.  This fits just fine on my TCL branded water cooler - no leaks.  It has concentric stepped rings in the plastic base which appear that they could help hold it in place on specifically-sized water coolers.  The opening on my cooler is actually smaller than the smallest ring, so it just sits on the flat base.