Feed Tube and Nozzle is the Water Feed Tube Inside the Humidifier, Which Connects the Solenoid Valve and Then to the Nozzle at the Top of the Unit, Which Connects to the Distribution Tray

Aprilaire 4231 yellow orifices are the tiny nylon components which, accurately meter the flow of water into your humidifier

They allow a specific amount of water to go into the humidifier, unique to your model humidifier

Used in Models 400, 400A, 400M, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 568, 600, 600A and 600M

Nozzle is the Component Where the Feed Tube Slides into at the Top of the Water Panel Evaporator Assembly. The Nozzle Attaches to the Water Distribution Tray at the Top of the Unit

Drain Spud is the Plastic Fitting that Attaches to the Base of the Housing of Your Humidifier

It is Designed to Connect to a 1/2 Inch Inner Diameter Drain Hose

Genuine Aprilaire humidifier replacement part

Ensures that the right amount of humidity is delivered into your home

Controls how much moisture enters your humidifier, making it possible to maintain proper humidity levels throughout your home

Compatible with Aprilaire humidifiers models 400, 500, 600 and 700

Patented water distribution system for maximum evaporative performance

Shut-off damper