Product review (3 stars): The unit works that's really all that matters. This ...
The unit works that's really all that matters.  This is my second valve though and I think it's a shame they don't last longer.  But as long as you have 24 V to the valve it will function and move water through your humidifier.  One issue with buying here is you pay full retail price which is `crap.  I've found the unit for $80-85 at reputable online retailers