New soil vent pipe

[Bullbags]

I need to replace an existing cast iron soil pipe with a plastic one.
The existing one is concreted into the ground. Can I cut the existing one at the bottom and attach the new plastic one via a collar, or will I have to break up the concrete and remove the whole lot?
Thanks.

 

[seco services]

you can cut above the floor and add a connector then plastic in to the connector.

 

[Bullbags]

Many thanks Seco

 

[kirkgas]

if you can cut and leave the bottem 3" you can fit a timesaver coupling which will bolt the cast and plastic together