Product review (5 stars): Perfect for an Aprilaire 600 Humidifier
The old solenoid had died- why? Who knows. It had stopped pumping water thru to the humidifier. I was quoted outrageous and princely sums by local HVAC shops and was very pleased to find it on Amazon at a reasonable price. It was a direct swap for the 24V solenoid that was in place and within 15 minutes we were back up and running. This does have a pre-installed inline filter on the inlet side FYI.