: Our Kohler Fluidmaster toilet whistles loudly for about 30 seconds, about the length of the fill. What to do?Bruce, Try flushing the ballcock out. Turn off the water to the toilet, remove the top of the fluidmaster valve (1/4 turn) place a cup over top of the ballcock & turn on the water and let run for 30 seconds or so. This should remove any obstruction and stop the noise. Good luck, Scott
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