None. It is the same as a normal toilet, 3" or 4" drain.
The dual flush toilet was invented by Australian Bruce Thompson of the Caroma plastics company in 1980. But didn't look like the traditional toilet so they redesigned it to look like a classic toilet.
yo eat peporini pizza and then flush the toilet
you flush the toilet
remove and install a new filler valve and get a proper flapper for your toilet at a plumbing supply
This could be an indication of a blockage or you may need to install more venting lines.
Install a proper vent
He Invented The First Flush Toilet In 1568.
Well, it depends how many times you don't flush a toilet. If you don't flush it one time, nothing happens. But if you don't flush it for a month or something, and then you finally flush it, it may get clogged with toilet paper.
both
Yes, a toilet does flush counter clockwise in the USA.
Don't Flush any kind of animals. You can only flush toilet tissues.
A toilet has to be vented otherwise you are trying to force liquid against the air in the drain and it is pulling against a vacuum. It will never flush right.