This is an OEM Napoleon GD3200 Retrofit Burner Train Assembly (Natural Gas) Kit that is compatible with the GD3200 when the mercury flame switch is needed. This is a genuine replacement fireplace burner, it is not an aftermarket copy. Part Description: This kit replaces the mercury switch system (which is no longer available) with a thermocouple/thermopile system. It includes a new gas valve, burner tray (Does not include the burner) and pilot assembly. This is for natural gas units only. Napoleon Part Number: W010-2488 (same as W0102488) Applicable Napoleon Models Napoleon GD3200 – Natural Gas (Mercury Flame Switch Models Only)