I purchased the traditional design K1893C-VS soap dispenser 2 years ago and the soap stem corroded and just fell off into the kitchen sink.  We do not have hard water and our Kohler stainless sink and faucets have been fine.  The stem of this dispenser is constructed from an inexpensive alloy that obviously has a short life span.  Kohler should honor a warranty longer than one year on a product that has had many customer complaints with the same stem problem.