Toto Drake Overfilling

[TrooperAl]

My Drake is 2 years old and the fill valve does not shut off causing the water to overflowe. Do I need to replace the whole valve assembly? Where can I get parts?

 

[Terry]

If it's the Korky style, then the simple replacement of the assembly cap does it.
Instructions are here
www.terrylove.com/korky