Toilet cistern valve leak

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17 Jul 2026
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I have a small leak which I think is located within the red box in the attached photograph. It seems to be between the plastic part which looks intended to be turned by hand and the threaded section. I don't seem to be able to turn it by hand in either direction though. Any idea how I should proceed? It doesn't appear to be like any of those I've seen on YouTube. Thanks.
 

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As said, use a wrench to loosen it. It's definitely removable. It will have the changeable diaphragm in there.
 

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