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[/url] Yes, that's the one. The drain does have several right angled turns in it - two of them within about 50 cms of the trap - so I'm guessing that might be where the clogging is. The pipework is not very accessible, so will a chemical drain unblocker clear it do you think?

Hello TeaTime - many thanks for your reply. No, I definitely mean from the bottom of the valve. I have looked at the McAlpine website and it says "The Silentrap has been most rigorously tested and will not unseal even under the most abnormal conditions", but that does appear to be what is...

Hello. I'm hoping someone will be able to help me with this problem. The silentrap (bottletrap) under our bathroom sink is leaking from the bottom of the valve, but only when the sink has been filled with water then the plug removed - and even then not always. What might be causing the problem...