232317 Suburban 120V water heater thermostat L140F 

140 degree Suburban RV water heater thermostat limit switch assembly with an emergency cut-off of 180 degrees. 120 Volt.

Also known as part number 312153 and A-232320-2.
To change water temperature, order switch # 232306 for 130 degree water or switch # 520788 for 150 degree water. Remember, these are 120V switches. 12V switches also available.