Auer Steel
Part #4021
MFG #4021
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Part #4021
Orifice-red For 112/224/330
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- Brand: Aprilaire
- Aprilaire 4021 Red Orifice is 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 the Models 112, 224 and 330.
- Aprilaire Replacement Orifice, For Use With: Model 112, 224 and 330 Humidifier, Nylon, Red, 11/64 in OD