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The outside diameter is more important with PVC pipe because that's how the fittings attach. For instance, DWV (drain) pipe and SCH40 pipe have way different wall thicknesses (so different inside diameters) but the same outside diameter. That said, you have a 3" pipe there, and should get a flange made for 3" pipe. What you will typically find will be a ...


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Wow, that's a pretty advanced state of decay. I'll guess that the pipe is cast iron and hope the stuff you see that looks like dirt is finely crumbling bits of rusted pipe. It looks like the end of the pipe is broken away such that it would be hard to make a reliable gasket seal between the toilet and the pipe. It's worth noting that it's always important ...


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