The Autoflo 244D model has been discontinued for years so the evaporator wheel and disks are no longer available. If you need those items you need to replace your humidifier. Contact us if you need to replace this unit. We do have a model 86UD available but it is made by Skuttle. It is a good substitute for the model 244D and is similar in design, installation and function to the Autoflo 244D. Please contact us for more information on it.