Polypipe Ring Seal Soil 110mm to Rainwater 68mm Reducer Adaptor Converter SD46b Black

is 68mm the diameter of the inside of the smaller end of the pipe? If yes, whats the exact diameter of the outside of the smaller end of the reducer?

Can you get an adaptor to fit a 50mm down pipe

What are the dimensions of the reduced section

Does the 110mm end fit into a 110mm female soil pipe socket (the one with a rubber gasket)?