A cutaway of the Toto Ultramax showing the sweeping trapway,
and how it points the waste down the drain.
That little dip will hold water between flushes too.
It helps to fool it into thinking the trapway is smaller, which creates more suction.
When the solids are sucked though, it finds a round 2-1/8" trapway.
http://www.terrylove.com/pdf/toto_cst854_2.pdf
How a Toto toilet flushes





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