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Two ways. Caulked joints and ty-seal joints. Cut the cast iron behind the hub and use a Clamp-all to join it to PVC pipe. If this sounds too difficult, CALL a Plumber.

Why do you want to replace your cast iron? That would be alot of work, only replace what you need to. Unless it is your sewer line then i would replace it all to the main. I agree with answer # 1.

IN ADDITION:

Back in the day, cast iron joints were sealed together with hot lead. Depending on the position of the cast iron pipe and the size of it. Either one can cut the cast iron piping and clamp PVC to it or you can melt the old lead out of the cast iron joints and place PVC piping inside and then "recork" (reseal) it with prattley putty to prevent it from leaking.

CORRECT

1- Older CI roof drains were installed by Caulking using oakum and then pouring molten lead

2- Some older CI drain drains used a Durham system meaning the Cast Iron drains were SCREWED the pipe galvanized in most cases and then the galvanized was caulked into a cast iron bell.

It is unprofessional and highly unskilled to replace a cast iron leader line with plastic for several reasons.

Seems the non skilled always try to use some type of epoxy..

You may want to contact a licensed master plumber who has had the required 10,000 hr apprenticeship training

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Q: How were the old cast iron drain pipes connected and how can they be replaced?
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