Mercedes Benz OM603 W126 W124 water pump and thermostat housing with coolant return pipe. Item came off of a running and driving 1987 300SDL and never leaked coolant. Item is free of damage or defects. All mating surfaces are in good shape. The coolant return pipe is W126 specific and is in ok shape and never leaked either. There is some corrosion present on either end. Part number: 6012010301 Fitment: 1986-1989 300SD/SDL 1990-1991 350SD/SDL 1987-1993 300D/TD