The invention relates to a device for transporting a fluid medium, particularly for metering a liquid reducing agent into an exhaust gas system in order to reduce pollutants in an exhaust gas, comprising at least one heated transport line and at least one system component with a heated internal region. The transport line has a line connecting piece, and the system component has a module connecting piece that is directly or indirectly coupled, preferably detachably coupled, to the line connecting piece. The device includes at least one heat conducting sleeve that can be inserted in the line connecting piece and the module connecting piece. The heat conducting sleeve is thermally coupled to the heated transport line and/or the heated internal region in order to transmit heat.