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how do I remove this to replace the washer thing at the bottom to stop it leaking into t he toilet?
Welcome to the Bunnings Workshop community @Wicket. It's wonderful to have you join us, and many thanks for your question about replacing an outlet washer.
You might like to have a look through this helpful guide: How to fix a leaking toilet. In your case, I suspect that the inlet hose and the inlet valve need to be disconnected from the central outlet valve. Once the outlet valve has been isolated, you should be able to either 1/4 turn it anticlockwise or release clips that retain it.
Please let me know if you have any questions.
Mitchell
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