Aprilaire 4021 Red Orifice for Humidifier Models 112, 224, 330

Aprilaire 4021 Red Orifice for Humidifier Models 112, 224, 330

Regular price $3.50 Sale

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.