GeorgeCT: The symptoms you experienced from the Voreto valve in your picture are exactly why I ripped it out and put in a Korky in my Drake. The 528MP is perfect for our Totos. As you may have read elsewhere on this forum, Toto is now selling basically the 528MP as its Universal Replacement fill valve. The packaging is different and the instructions are more precise, but it's basically the same thing. I'm glad it worked out for you.