The soil pipe is horizontal, the correct height. But the cast iron opening is 5.5" / 140mm inside diameter. After a depth of 2" the diameter steps down to 3", for the next 4" before going into the wall.
What kind of toilet pan connector do I get. I can't find anything that looks like the original.
It seems that I might have to saw off the wide 2" long mouth part leaving a straight 3" pipe. But I'd rather find a suitable pan connector fitting. The pan opening on the new toilet is also 3".
Different pipes carry water to and from your toilet, and each pipe has a different diameter. If you plan to install your own toilet, you have to know which size pipe to use for each plumbing route. According to my experience, 4 inches pipes are often used for toilet pan. You can try for it.
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