After 3 months of using this flush valve I can say that it flushes very well. BUT the problem is that the water in the toilet bowl flows into the toilet bowl under the flush valve cover. This means that in my case the tank is filled about every 30 minutes. That's a big waste of water, very annoying, not what a valve is supposed to do! Since the original flush valve broke after a few years, I'm not sure the US standard parts are reliable. Also, I just called customer service and AS said they couldn't do anything about the part I bought from Revain. In the long run, replacing a toilet can be cheaper than going through all this part swapping hell.
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