When did Kuhn start putting valves on them mine had a bar that you switched to rake with oneside or with both sidesbigbull338":1xdssoij said:i was going to get the kuhn 12 wheel speed rake because i liked the way it was built.plus the fact it has valves you can turn on an off to lower the right or left hand rake by its self.we ended up buying a like new 8 wheel rake insted of the kuhn.