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konastab01
@Bainbridge
We had a downstairs toilet installed when we renovated and a month after we've moved in there's a 'drains' smell in there.
I just unscrewed the black cap on the plastic pipe on the right (I have no idea what purpose it serves) and when the cap is off there is a draught coming into the room which smells of drains.
We will have the company who did the renovation back for snagging in around a month, so if it requires a plumber that's fine. However if someone knows an easy fix, or something I need to check out sooner than that I would appreciate some plumbing knowledge!
EDIT just realised the black thing is marked. It's an 'Air Admittence Device'
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