Connecting UPVC soil pipe into existing cast iron stack

[GuinnessMK]

What do I use to seal / join the two?

The cast iron stack has shoes every 4', into which slots the next section of pipe, sealed with a ring of mortar around it. I'm thinking break out the mortar, remove the cast sections above the shoe, then put the new UPVC pipe into the socket in the shoe. Do I seal that with mortar / silicone / PU sealant (have some left over from another job!).

Cheers

[GuinnessMK]

All done. Quick phone call to the merchant this morning found the correct black plastic adaptor with a seal made by the rubber fins.

Picked that up on the way to collect the scaffold tower. Old cast iron cut back with angry grinder, new UPVC from the new ensuite extended and connected into the existing cast stack. All done, mortared up, tested and water proof!

Thanks!

[GuinnessMK]

The cast iron was in sections, at the top of each section is the bracket which attaches to the wall.

Cut the cast pipe down to the bracket, cut / hammered / drilled the pipe and mortar out of the socket. Cleaned it out, pushed the plastic / rubber adaptor in, which looks like a WC connector but in black :-



Fecking hope that is right, fed up of being up that tower!