A Kohler toilet makes noise during the refill cycle due to high water pressure rushing past a restricted fill valve seal, worn-out internal rubber diaphragms vibrating at high frequency, or mineral scale buildup inside the valve body. As water forces its way through the narrow valve gap, it causes acoustic vibrations that echo through the ceramic tank and plumbing pipes. Verification: Service or replace the internal fill valve diaphragm seal to restore quiet, smooth tank refilling.
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