The flange is shot. I would like to join PVC to what appears to be lead???

The hub/joint going in to the wall looks ok. I would like to use a rubber fitting to joint to PVC closet bend. The pipe isn't 100% square and appears to be too large for a 3" inch rubber fitting. Will 4" work? Or should I squeeze a 3" on? Will the lead hold up and not deform?



Here is the fitting on top of the flange just for size reference





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I would take the lead out back to the cast iron (appears to be a cast iron hub at the wall?) and join PVC to it. Lead pipe can only be trouble waiting to happen.

Hmm. Glad I asked.

What should be the best way to join PVC to that hub?

The lead pipe can be cut flush with the hub and then taken out of the hub by cutting into smaller sections. Then a neoprene hub gasket (don't look for one at Lowes or Home Depot, they won't have it, go to a plumbing supply house) can be placed into the hub and 4" PVC pushed into the gasket. Ask the counter guy specifically for a 4" plastic X 4" cast iron hub gasket.



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there will be a 4 inch brass ferrule caulked into the cast iron hub. melt off the lead pipe leaving a nice clean brass ferrule. try a coulple different banded couplings to see which size fits best. then use it to clamp to the ferrule.

When you say caulked do you mean with lead? Will the ferrule come loose when I heat it?

I already bought a 4x4 and a 4x3 donut that m&m suggested up thread. But I'm not opposed to clamping a coupling as I have done plenty of that before.

I'm thinking of reducing to 3" PVC just for height issues. The 4s seem like they rise more (or am I wrong?)

don't worry about melting out or even loosening the leaded in ferule. it takes very little heat to melt off the lead pipe from the ferule.
yes, reducing to 3 inch will save you height.

I ended up cutting the (cast iron?) ferrule and lead pipe pipe (got a little chicken with sparks flying everywhere).

So I have the hub cleaned out. Should Sand it clean?

I found the proper fitting to squeeze in with the PVC reducer.

I have a question about how far to tap the PVC fitting in to the hub.
The PVC has a lip (see pen in photo). When you tap it in far enough, the lip seats in real well. But it doesn't seem as tight. I backed it out a little but then the PVC wants to squeeze out on its own.

I'm wondering if tapping it past the "lip" is the right way to do it. It still seems tight. But not super super tight.




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