My toto toliet with smaller flush valve (2"?)

[michiele]

We bought a used toto from a bathroom remodel. After looking inside the tank, I am totally confused. I thought toto toliets had the 3" flush valve, but this one has a smaller one, maybe 2". And the flush assembly (don't know what the name of it is) is just a normal one with a big black floaty, instead of a gmax one. Both the tank and bottom say toto on them, but I am wondering why it has the smaller flush valve etc, and how can I tell what model it is? Thanks so much!

[Terry]

You can post a picture of it,
The Toto that uses the 2" flush valves are
CST703 CST704
CST713 CST714
CST723 CST724
CST733F CST734F

The 3" flush valves start with
CST743 and CST744 series and then the numbers keep getting bigger.

The Dual Flush uses a 2" Flush valve and their number start with
CST414m, CST416M, CST464MF