Help joining soil pipe

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13 Sep 2012
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Hi all. My scaffolders pulled off a section of the iron soil stack. In fairness it was in poor condition. I've just been up the ladder to have a look. There's a short section that joins at the 'Y'. I thought it was all cast iron, but looking closer it's quite badly dented, so it may be hard to cut back to a section that's properly circular. It feels metallic when I tap it. The pipe appears to be a single piece (no joins) that does a 90 degrees in to the wall. I'd prefer not to replace the through-wall bit. Questions:
- what's it made of?
- can I cut it with an angle grinder, which was the original plan?
Appreciate any thoughts and comments.

ETA: To clarify: original plan was to replace Y with a plastic Y, add a small section of new pipe, and new plastic pipe above and below, joining to better condition cast iron pipe lower down.
 

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Judging by the rust appearance, I’d say it’s cast iron. The branch off could be cast iron or lead. Scrape the paint off it, see what colour it is underneath.
 
Thanks - I'm fairly certain the branch off is lead judging by the dents/deformations that you wouldn't get in cast iron. I'd only ever seen cast iron and plastic ones, so it threw me a bit. What's the best way to join it to a new plastic Y? I've bought some push-fit slip couplings and the rubber sleeves with the big jubilee clips. Any good?
 
You might be able to use a dc1 but might not get the lead in, so probably best with the flexseal with jubilee clips.
 
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That is a lead bend it will almost certainly brass section soldered to it where it fits into junction,
The lead will be easy to re round proper tool was called a plumbers dummy (still got some somewhere) but you can make do with a hammer shaft or similar
Once you have it back to round be much easier to join.
If you need to shorten it old hand saw works well.
 

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