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The GeneralAire 7091 is the correct replacement bypass collar for the following humidifier models:
The GeneralAire 81-3 Humidifier Bypass Collar is a replacement bypass collar for the GeneralAire Legacy Drum Model 81 Humidifier. The GeneralAire 81-3 bypass collar fits onto the side of the 81-1 humidifier cabinet. The GeneralAire 7091 by-pass collar is an OEM replacement part for your 81 model drum-type humidifier.
GeneralAire 81-3 Humidifier Bypass Collar specifications: