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The GeneralAire 7121 is the correct replacement float arm for the following humidifier models:
The GeneralAire 727-34 Humidifier Float Arm is a replacement float arm that fits the GeneralAire Legacy Model Humidifiers 1040, 1042, and 1137. The 727-34 float arm promotes the flow of clean water through your Legacy humidifier and helps humidify your home. The GeneralAire 7121 is a very reliable genuine humidifier replacement part that will allow your unit to operate at peak efficiency.
GeneralAire 727-34 Humidifier Float Arm specifications: