This is for a 1970-built house. I bought a toilet pan connector, but it comes nowhere near fitting the current arrangement.
Here are some pictures:
(There are actually two toilets pictured, one that's failed and one that's still working.)
The pan has an outlet with a diameter of 4 3/8" (4.375")
The soil pipe looks like it might be a standard 4" one, but it has a bend and enlargement to around 5.5" diameter. It's all in solvent weld plastic.
The pan slots into the enlarged bit, with a black rubber collar round it
- see the pictures. There are no seals inside the pipe.
Does anyone know where to get the black collar from, or even what it's called? I could go back to scratch, cut most of the the pipe off, and go from there. But that's a bit drastic, compared to simply fitting a new collar.