I have one of these one piece Kohlers and it is a lousy flusher. The float/flapper adjustment is touchy but even when right it still may require 2 flushes to make everything go away. There is another problem with the 1.6gpf. If you are a long way from the vertical riser 1.6 gallons may not be enough water to ensure the load makes the whiole trip. In a ranch type house, if you use the far end guest bath for those "big loads" and don't use any other significant amounts of water from that end of the house it may end up clogging the pipe. If nothing else be sure you wash your hands ;--)
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19 years ago