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If you are already getting leaks in the cast iron I think your very best (but not cheap) method is to remove all of the cast iron to the main stack and put in PVC.
Seriously cast iron lasts a very long time but if its rusted thru / leaking remove it all now or suffer for years to come.
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Thanks, Trump for the civics lesson. We are learning so much about RICO, espionage, sedition, impeachment, the 25th Amendment, order of succession, nepotism, separation of powers, 1st Amendment, obstruction of justice, the emoluments clause, conflicts of interest, collusion, sanctions, oligarchs, money laundering and so much more.
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