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Cast Iron To PVC Pipe Connector

Question: My home was build before the washers were used in the basement. The sewer pipe is cast iron coming from under the cement floor up the corner of the basement. My question is I would like to start just above the floor and change the cast iron to PVC heavy wall 4 inch. The cast iron pipe is 4 inches on the outside and new 4 inch PVC is 4 1/4 inches on the out side. Any suggestions?

Answer: They make a cast iron to PVC connector fitting. It should be available at your local big box retailer or plumbing supply wholesale.