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.

Plumbing Services in Woodland Hills, Los Angeles California.
https://richardsrooterandplumbing.com/

Plumbing Services in West Hollywood California.
https://plumbingemergencylosangeles.com/

Plumbing Services in Los Feliz, Los Angeles California.
https://24hourplumberslosangeles.com/

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