I hate to be negative but I am about to return my Dual Flush Converter.
HydroRight Dual Flush Converter-HYR271 at The Home Depot
I am getting tired of trying to adjust it to get it to seal properly. I can still hear the tank refill once every 10 minutes. If it is going to be that difficult to seal initially, I don't even want to know what it is going to be like in 5 years. Also, like others, I cannot seem get enough water to make the "small" flush actually fully flush the toilet. Perhaps I will revisit something like this in the future but, for right now, I prefer reliability and hassle free over savings.