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View the thread, titled "Mystery open kitchen drain behind wall - need advice about plugging it" which is posted in UK Plumbers Forums on UK Plumbers Forums.

My kitchen sink drain became blocked and, while unblocking it with a plunger and lots of water, I saw the dirty water leak from behind drywall about 6 feet away from sink. I had previously noticed a smell from the same area and dampness on the drywall.

So I cut open the drywall and find an open pipe coming up from the floor, and the dirty water was coming out of that pipe. see picture attached.

I think this is wrong, probably against code, and I think I should put a screw on cap to close this pipe - but I'm guessing.

Please will someone give me their thoughts on this. Why is it like this, what's the purpose?
 

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