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@terlg
So any ideas for 'blanking' a cast iron pipe. We recently installed a new bathroom and the soil pipe enters into the top of the stack somewhere above the stack as it's pictured in the attached.
I'd failed to consider the fact that there were additional arms off the stack which terminate in the walls (and don't join anything).
After a few days of using said bathroom - there appeared a mysterious leak in the flat below. After ripping up of floors (convinced it was my bad plumbing) it turns out i'm pretty sure water must be getting into the join, flowing down it and then emptying into the wall.
Any recommendations for blanking off the arm of the cast iron? Don't want to faffing around removing it completely or cutting the main section.
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