Description
Description
The Aprilaire Yellow Orifice #4231 is the tiny nylon components which accurately meter the flow of water into your humidifier, allowing a specific amount of water unique to your model.
Compatible Models
- 400, 400A, 400M
- 500, 500A, 500M
- 550, 550A
- 558
- 560, 560A
- 568
- 600, 600A, 600M