The present invention relates to a water turbine draft tube (1) being provided in its interior with a co-axially mounted diffuser (6), wherein the diffuser (6) is closable by a closing member (7). The closing member (7) is arranged in the diffuser (6) interior (6) in close proximity to the diffuser (6) outlet profile or in close proximity to the diffuser (6) inlet profile. The closing member (7) can also be arranged between the diffuser (6) inlet profile and the diffuser (6) outlet profile or outside the diffuser (6) interior, too. The closing member (7) can be represented by flap (7) or a sliding gate.
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