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Connecting Two Different Types of Pipe
What kind of fitting should I use to connect existing 12-inch VCP (vitrified clay pipe) to PVC pipe?
Use a Fernco fitting. The web page below is from Fernco's website which has a list of adapters that connect clay pipe to plastic pipe.
http://www.fernco.com/1002.asp
Fernco.com also has a page where you can order the fitting by phone.
Once you know the fitting that you need, you could also call around to plumbing and utilities supply companies. They will have the larger adapter fittings, even from other manufacturers. Fernco is kind of the industry standard for flexible fittings.