The GeneralAire 7129 is the correct replacement drum bearing for the following humidifier models:
The GeneralAire 45-1 Humidifier Drum Bearing is a replacement drum bearing for the GeneralAire Legacy Models 747 and 747L Humidifiers. The 45-1 drum bearing is a crucial internal component of your 747 humidifier and will have it operating at peak efficiency in order to deliver clean moisture throughout your home. The GeneralAire 7108 drum bearing is an OEM GeneralAire replacement part.
GeneralAire 45-1 Humidifier Drum Bearing specifications: