A heat exchanger, preferably an Exhaust Gas Re-circulation (EGR) cooler for a vehicle is provided. The heat exchanger includes a housing, a pair of tanks, and at least one protuberance. The pair of tanks is adapted to receive respective end portions of the housing to form a first fluid circuit. The at least one protuberance is formed on the walls of the housing, in proximity to transverse edges of the lateral walls of the housing to engage with an inner wall of the pair of tanks upon receiving of the end portions of the housing in the pair of tanks. The end portions of the housing curve inwardly when the at least one protuberance is engaged with the inner wall of the pair of tanks.
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