This is the switch that turns the warmers (burners) on and off. It fits newer (1998 models and on, generally) Bunn VPR and VPS models - you must check the serial number of your brewer before purchasing.
Newer VPR = Starts with S/N VPR0270000 (and higher)
Newer VPS = Has lighted switches
Older models had non-lighted switches
with a separate red lamp.