The GeneralAire GA4021 is the correct replacement for the following systems:
The GeneralAire GA4021 Red Orifice is part of the ReservePro Series of professional OEM parts. Also known as part number 7590, this red orifice allows a specific amount of water to enter your humidifier. Some of the water will perform a flushing action while the rest of the water will evaporate. The water panel will stay clean through this process, while reducing maintenance.
General Aire Red Orifice Replacement specifications:
When replacing your orifice, don't forget to clean or replace your inline strainer. The GeneralAire brand is also known by the following spelling variations: General Aire, General Air and GeneralAir.