The GeneralAire 7565 is the correct replacement compression nut for the following humidifier models:
The GeneralAire P101 Humidifier Compression Nut is a replacement compression nut for the GeneralAire 570, 900, and 100 Elite series humidifier models. The GeneralAire P101 includes one replacement compression nut, though your humidifier model will require two compression nuts to fully operate. The compression nut tightens between the brass insert tube and the compression sleeve to form a tight joint. The 7565 is a genuine GeneralAire part made from durable material.
GeneralAire P101 Humidifier Compression Nut specifications: