Product review (3 stars): Does the job, could be more pliable
Works fine, but this is just one of those products that is destined to fail and could be improved. On the Aprilaire 550 humidifier, the supply tube enters at the bottom and makes a sharp turn to get up to the top of the panel. The tube itself is not very pliable, so the point at which it makes the turn becomes a weak spot and will eventually crack. If you're not careful, it can even crack during installation. I recommend warming it up with a hair dryer just prior to installation to make it a little more flexible.

I've had my humidifier for about 12 years and this is the second time I've replaced this part.