ᐅ Old cast iron drain pipe with plastic (HDPE/PP) pipe

Hi, I have an old floor-mounted toilet connected to a cast iron pipe leading into the floor. Now I want to install a Geberit system, which uses PVC drain pipes (HT pipes). My 110mm (4.3 inches) PVC pipe has a lot of play at the floor socket where the cast iron pipe is.

Is there a gasket available to seal the connection inside the cast iron pipe so that the PVC pipe fits securely without any play? Also, which types of silicone or adhesives can be used to fix it firmly to the PVC pipe?

If using a cast iron pipe coupling, then you need a set of measuring rings.

Cast iron pipe spigot ends (without coupling) require clamp connectors.