Is it plastic onto metal? If so then some kind of deformation probably.
Brian

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The Sofa of Brian Gaff...

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"ss" wrote in message
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I bought a new bottle trap for under the sink, there is the tiniest of
leaks, maybe about a couple tablespoons overnight, its coming from the
bottom part (the trap) that screws on to the top part, I have tried
tightening a bit more but still drips.
Any ideas to seal it 100%, although to be honest I cant understand why it
leaks.