Product review (5 stars): It helps me drain the swamp
This little device helps me drain the swamp in my humidifier.  It really keeps the little political colonies of bacteria from being able to take a foothold in the duct work.  Turning the water off and pressing the drain button on the front of it makes it easy to drain the humidifier so I can drop it down and wipe out the bottom to keep the scum from getting too intense.