I need to replace large portion of main DWV stack. My main stack is composed from two 4" cast iron Y fittings stacked one on another. There is then 4" by
3" cast iron reducer and then there is 3" copper stack pipe. All cast iron fittings as well as main 3" copper stack pipe connected to cast iron reducer are joined using bell end and lead. I need to remove all cast iron fittings except one that enters my house from the street. I need then to cut 3" copper stack pipe somewhere and replace all fittings and portion of copper stack pipe with PVC pipe. I will use no-hub coupling to connect PVC pipe to
3" copper stack pipe. However how to connect PVC pipe to bell end of 4" cast iron fitting that enters my house from the street? What's the proper way to do this?