I installed a bunch of these back when they first came out in a school and a bank a few years back. Removed two more of my installs again today, only two more left out there that I put in. I installed the newer flush valves when they came out too but they were still having major problems with faulty flushing and running. It has been a pain in my side ever since my wholesaler rep talked me into these. American Standard Never Again!:furious: