http://www.flushmate.com/Models/default.asp?market=1
Where I previously worked, I was involved with the design near the 'tail' end of the pressure mechanism development. A lot was also put into the evaluation/improvement of the NVH (Noise/Vibration/Harshness) of the system too. Tried and tested under a variety of 'loading' conditions -
It's a sh***y job, but somebody's gotta do it!