Product review (3 stars): Three opened boxes
I ordered three boxes and they were all opened even though they came in original Aprilaire Water panel boxes. I'm reporting to Amazon about investigating whheter the seller is opening the boxes and switching the original parts with some generic brand.  My original water panel had black and red paint on top of the panel, but all three products that I purchased via Amazon had single yellow paint. It did fit my Aprilaire 600 humidifier, but I feel a little suspicious about the open boxes and will probably not recommend or return for additional purchase from the seller.