Joining 110mm vertical soil pipe to cast iron pipe

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I've recently removed an old and cracked soile pipe from the rear of my house, which I had planned to replace with a nice new PVC soil pipe. I pulled down the cast iron pipe leaving a stump at the bottom to join to. However, I hadn't realised when I got the new pipe that the diameters weere quite different (110mm feeing into ~80mm). To make my life more difficult the cast iron pipe is pretty close to the wall, maybe only 15mm or so. I tried one of these but it seems too large for the cast iron. Photo below.

I'm now puzzling over how to make this connection. Is there a part or adapter that would typically be used in this situation?

PXL_20221112_114802643.jpg
 
Dig down a bit and look for traces of leakage, such as mud and red worms, as there is often a crack where the clay pipe in the ground turns from vertical to horizontal. If necessary, now would be the best time to fix it.
 
JohnD said:
Dig down a bit and look for traces of leakage, such as mud and red worms, as there is often a crack where the clay pipe in the ground turns from vertical to horizontal. If necessary, now would be the best time to fix it.
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I had a peer down the cast iron pipe. It goes down about 70cm and then turns at a right angle. There's concrete covering a large area around this pipe with scaffolding over it right now, so It's hard to dig down and get a proper look. Plan is to break up the concrete and resolve any other drainage issues next summer!
 
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