Stutz connection for heat exchangers

The invention relates to a neck connection for a in a housing (1) arranged heat exchanger (5), comprising a stack (50) of plates and fins, wherein the housing (1) consists of matable housing portions, and at least a first port (2a) for a heat-exchanging means in the housing is directly integrated and at least a second connection piece (2b) is present on other heat-exchanging means that extends outside the housing. The heat exchanger can provide with relatively little installation effort when is integrated directly or indirectly according to the invention and the at least one second connection piece (2b) which is formed on one side thereof for connection to a conduit in the housing (1).