I purchased this along with a Kohler double bowl sink.  I spent the extra money to buy a nice Kohler sink drain and strainer and it is such a waste of money.  The stopper will not retain the water in the sink.  I called Kohler when I first noticed and they sent me a new strainer basket and O-ring.  I was really hoping this would be the solution but it is not.  Now I have a new sink that will not hold water.