Genuine OEM Napoleon Replacement Part # W690-0002 Switch use in the GZ550-KT blower kits Napoleon / Timberwolf Wood stoves: TI-2201, NC12, NC16, NFI-C (Classic), NFI-D (Deluxe), NZ2000, WM1020, NM2020, NZ25, EPA1000, EPA1500, EPA2000, EPI1600, EPI 1401, EPI22, 1100 Napoleon Gas Stoves: GD70 STARfire Series, GDI30, GVFS60-1, GDS60 Thermostatic sensor control for Napoleon woodstoves & Gas fireplaces. This switch is used in the GZ550-KT blower kit