How do I stop my toilet from groaning or singing as it finishes fillin

How do I stop my toilet from groaning or singing as it finishes filling the tank? I have 3 bathrooms and only one does this. Does anyone have any ideas?
  1 answer
  • KMS Woodworks KMS Woodworks on Jul 30, 2013
    Check the fill valve where the supply hose is connected...try it with it fully opened and partially closed, sometime a slight flow rate change can fix these.