This is the Toto CST854 Model Toilet. The part number for the replacement Flush Valve is THU831-A.

I replaced the flush valve on the Toto CST854 model Toilet. The part number for the replacement flush valve is THU831-A.
The old Flush Valve part is discontinued and the new one is a flush tower replacement part.
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[@Straycurrent]

No need to pull the tank to change the flush valve. Innovative. I was not aware.

[@richyyaz]

This toilet is a one piece Toilet, so it's different than a 2-piece toilet that hasn't tank attached to the bowl.