I've seen repeated instances of the plastic feed tube breaking on the Aprilaire 600 humidifier. The break always happens at the sharp bend where the feed tube passes from the outside to the inside of the humidifier cover. It seems that the plastic is too brittle.
Anyone else seen this? Any ideas how to fix it? I suppose I could replace the feed tube along with the water panel during the annual maintenance cycle. But I'd rather be able to fix this once for all time by putting in a less brittle feed tube.