Field Controls 094021A0205 , EWC 2002 Thermister probe assembly.
Thermistor probe is for Ultrazone, EWC and Field Controls, models S2000 and S2020 steam humidifiers.
This probe comes with a new washer and nut. This replacement thermistor probe is slightly shorter than the original.
When this is installed, make certain the probe does not touch the heating element. If this occurs, slightly move the heating element away from it about 1/4" minimum.