Product review (3 stars): Despite the photo on the product page, this is the plastic version.
I can't give it 0 stars because it is the OEM part, however I wanted the newer metal type.

It any case, It does not fit the aftermarket solenoid valve [http://www.amazon.com/Aprilaire-Generalaire-Humidifier-Solenoid-Valve/dp/B003673GVE/].