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The Aprilaire 4005 is the correct replacement for the following humidifiers:
The Aprilaire 4005 Water Solenoid Valve Assembly is a 120V replacement solenoid water valve. The Aprilaire brand is also identified by the following spelling variations: April Aire, April Air or Aprilair. Also known as part number 4005, this humidifier solenoid valve assembly includes a compression washer and nut on the inlet side of the valve.