I bought what I later believed to have been an opened box shower valve for a second bathroom in my home. After the install I found out (by using the trouble shooting guide included by Moen) that the valve was likely stuck. Took it into the retailer and no questions asked they simply gave me a new valve. Moen has a lifetime warranty so no questions asked. The box was also missing a set of screws and a set screw. I phoned Moen and they shipped the missing screws to me immediately. Very happy with the service.