I took the boxing out from around this toilet yesterday to find this old style clay(?) or concerete (?) soil pipe. The existing toilet has a 90 deg spigot on the back but obviously the replacement is a nomal modern one. Can I just break the solid seal around the old spigot, whip it out and then insert a modern 90 deg pan connector in far enough to seal on the main body of the pipe? Or do I need a specific adapter? I have other work to finish in the room but didn't want to take it out and leave the client without a toilet because I don't have the correct adapter.