Posted to alt.home.repair,uk.d-i-y
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Why did drainpipes used to have a box on the wall?
Commander Kinsey wrote
Why did drainpipes used to have a box on
the wall, some sort of overflow if blocked?
Yep, and plenty still do, particularly with bigger buildings.
See link below for an example photo.
https://www.dropbox.com/s/1jry8zas14bmivc/box.jpg?dl=0
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