Product review (5 stars): SCORE!  2 of these for less than the cost of 1 from the manufacturer!
I'm sure glad I found these on Amazon.com.  It cost less for 2 of these than it would have cost from the manufacturer (it was $25 for one, there)!

These fit exactly like the ones that were on the water tanks when I bought the humidifier.  It pays to shop around, that's for sure!