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All flush cones are slightly smaller internally than your flush pipe so when the flush pipe is inserted into the pan the pipe will expand the cone to create the seal
As they are rubber or plastic there will be a chance that some come misshapen slightly but once fitted will be perfect.
For flush pipe at back of toilet pan with hole From ID 53mm-58mm, will fit 38mm OD flush pipe.
Can replace external type, as long as the toilet pan internal hole diameter 53-58mm