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Discuss Leaking pop up waste from bottom side in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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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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Yes need to seal both sides
 

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