What's the Toto Drake3 CST746 series flush valve size

[Londondrug]

I am debating where to get a Toto drake CST746 or American standard Champion 4. Champion 4 has a flush valve size 4" which is good, but I can't find the new Toto drake's flush valve size information on Toto's web page. I like toto's Dynamax Tornado Flushing system though. Is it only come with 2.5" flush valve? Is it powerful enough?

Thanks for your help and opinion with this!

 

[Terry]

The Champion 4 is a 3" with a 2.25" trapway.
The CST746 is a 2" with a 2.5" trapway.

I would give the TOTO the edge on flushing. They are certainly easier to install.

The Champion leaves a lot of water in the tank because of the way they raise the flapper in the tank.

https://terrylove.com/forums/index....6csmfg-01-locally-greater-seattle-area.83074/

Large 2-1/2" trapway on the new CST746 Dynamax Drakes.

Very little water in the bowl. More cleaning is needed. It needs much more cleaning.
Men complain that the front of the bowl is too shallow for them.

ST746 series tank.