There are no proprietory connections available for connecting plastic to cast and we would not recommend this connection under the floor at all. It can be made with a large rubber collar with two huge jubilee type clips but, as I said, is really inadvisable. For a wet room construction ( see our project on wet rooms and walk in showers ) you need to be absolutely sure that your connection sra sound and we would suggest replacing all of the cast with plastic pipe.
Thanks for your reply. What steps do I need to take to replace the whole cast iron pipe in plastic? The cast starts in my bathroom and extends out towards the front of the house going under the floorboards and beyond; does this job require digging up the driveway?
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