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Eberpsacher Espar Airtronic M3 B4L Gasoline Heater Unit and Fuel Pump Replacement 12v Genuine Eberspacher Espar replacement geater for existing installations of the M2 B4L or M3 B4L Direct replacement of previous version model number 201987050000 M2 B4L Includes repalcement fuel dosing pump Technical support and additional parts available from Butler Technik For new vehicle installations requiring a full heater and install package please see link below - Petrol Gasoline Vehicle Heaters by Webasto Eberspacher Espar | Butler Technik