This switch is used on most Bunn home coffee makers for models made in 1998 and after. It is the on off warmer switch located on the front of the home coffee machines. This switch should fit Bunn Velocity Brew models GR, GRX, BX, GR10, B10 and others. Before purchasing this switch, measure the old switch to make sure the front of the switch is approximately 0. 50 inch x 0. 75 inch. If your warmer does not turn on or if the switch doesn't light up, this is the first thing to try replacing. In addition to its use on the Bunn home coffee machine, this switch is used on Bunn commercial warmer model WS2 with rear mounted switches.