General Aire 81-13 Thumb Screw
The 81-13 thumb screw is used to secure the humidifier cabinet over the internal components. The part is called a thumb screw because it is meant to be turned with your fingers, and does not require any tools. The screws should work properly for a long time, but eventually the treading may wear out, and the screw will need to be replaced.
Also known as part 7095