I have a 3.5 gpf wall-mounted commercial toilet with a “spud” flush valve (Chrome T-shaped valve like above urinals) that uses more water than I’d like. I was wondering if it is possible to just buy a new 1.6gpf spud valve and put it on the old toilet, thereby making it a 1.6gpf toilet. Would this work? If so, does someone make a special “retrofit” valve, or will any 1.6gpf spud valve work? Does anyone know where I can get a valve that will accomplish this?Thanks!