Product review (3 stars): Third for our humidifier...
This is the third of these valves we have installed. They work perfectly when installed. The first came with the humidifier and lasted about two years, then would not open, so we did not get any humidity. We replaced it. The second lasted less than a year before it started humming loudly when it came on. Until I could get another, I found whacking it with a wrench would shut it up for a while, then that started to fail as well. The new one fixed the problem completely (again) and everything works again, but for how long? These are the OEM valves. I have to wonder why they don't last just about forever.