Febi Bilstein Viscous Fan Coupling - 17846. This radiator fan viscous coupling is a precision fit for various Mercedes Benz models. It is designed to function as originally intended and should be installed by a competent individual. Please ensure compatibility with your vehicle before purchasing. Specifications: Brand: Febi Bilstein, Quantity: 1 Unit, Outer Diameter: 160 mm, Pitch Circle Diameter: 147 mm, Weight: 0.87 kg. Replaces part number 17995.