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Leaking pop up waste from bottom side

View the thread, titled "Leaking pop up waste from bottom side" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi guys, I have just installed a pop up waste on new basin.

I have siliconed the top with the washer, and the water holds inside the basin with the waste closed but when I pop it up to release the water down the drain it leaks out from the underside of the sink where the backnut nut washer are, before the trap.

I could just silicone the back nut washer but then I would be simply trapping the water inside and that doesnt seem right.

What can I check?

Any advice massivley appreciated














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paul alan,
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Gasmk1,
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