Reznor 101900 Switch 321042-401 use a WEL14A-602R bulb well

use a WEL14A-602R bulb well or a compatible packing nut to protect the sensing element

Is the dial included with this switch

Contractor Grade: Designed for rapid installation in Amana-Goodman air handlers

Quiet Operation: Designed for low-vibration performance and smooth ramping to minimize startup noise in residential ductwork

optimized for maximum CFM delivery across the coil while maintaining low decibel levels

Reznor 101900 Switch 321042-401 use a WEL14A-602R bulb wellThe Reznor 101900 Switch is a critical heavy duty replacement HVAC part designed for field technicians managing seasonal system transitions. This Double Pole Double Throw (DPDT) toggle switch is rated for 15A current handling, providing the electrical overhead required for reliable operation in industrial and commercial unit heaters. Built for a Winter Off Summer configuration, it allows contractors to manually toggle between heating and ventilation