This valve was very substantial and works beautifully.  We were replacing back to back valves in two showers.  There was not enough space in a standard wall to follow the Kohler product installation instructions. My husband called Kohler and they were unable to help him with the problem.    Fortunately, my husband is an engineer and was able to install the products so that both showers regulators are correct rather than reversed which is a short-cut many builders take during the building process.