(57) The invention relates to a flow channel for the passage therethrough of a fluid,
such as flue gases from a heating boiler or the like. The flow channel comprises a
first and a second flow channel part, between which a blocking element, such as a
non-return valve, is disposed. The flow channel further comprises a water seal for
diverting condensation around the blocking element from the second flow channel part
to the first flow channel part in use. According to the invention, the flow channel
comprises a water seal comprising two water seal elements, one of which operates in
a first orientation of the water seal, and the further water seal element operates
in a position of the flow channel rotated through substantially 90° relative to the
first orientation.
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