Plumber went to install this today and the plastic part that tightens underneath the sink (the white plastic "nut" looking large part) would not tighten properly.  He said he can't use it.  Hoping we can get something done because our window of return expired 2 weeks ago.  Only 30 days to return so beware and don't order your parts for your new home until you're ready to install.  Should have paid attention to this:(