Product review (4 stars): solenoid for aprilaire 224
I replaced a leaking solenoid on a model 224. This solenoid works as it should with no leak. When replacing a solenoid, make certain to retain the red plastic orifice. None was included with this solenoid so I reused the old orifice. The red orifice works with model 224. Make certain you have the right color orifice for your particular model.