The Aprilaire 4100 is a compatible part for the following humidifier models:
The Aprilaire 4100 Humidifier Pump Rebuild Kit is a pump rebuild kit for several Aprilaire humidifier models, including the 445 and the 448. This Aprilaire humidifier water pump rebuild kit includes an impeller and pump casing, but does not include a replacement motor. Maintaining the factory setting performance level of your Aprilaire humidifier is easy with this pump repair kit, which is low maintenance and built from high quality material. Aprilaire parts are sturdy in construction and long lasting.
Aprilaire 4100 Humidifier Pump Rebuild Kit specifications: