Why Does a Filler Tube in Toilet Tank Whistle After Flushing?

Any noise emanating from a toilet other than the whoosh of an efficient flush calls for an investigation. Even when forced under pressure though pipes and plumbing fixtures, water is normally rather quiet. A whine or whistle often means the flow is being restricted at some point. In a toilet, that point is usually the filler tube in the toilet tank. Whistling is common in older ball-and-arm style filler valves. Replacing it with a newer valve will solve the problem. When a modern valve starts to whistle, it might just need a thorough cleaning.

Paper towel
Small empty cup-shaped container

Instructions

- 1
  Turn off the water supply to the toilet. Remove the toilet tank lid and set it aside in a safe location. Locate the filler valve assembly, which is usually found on the left side of the toilet tank. Lift up on the float lever and gently turn the top portion of the valve assembly counterclockwise until it lifts off the valve body. Move the valve top slightly to one side and rest it on the edge of the toilet tank.
- 2
  Hold a small, cup-shaped container over the open hole in the valve body to deflect water back into the tank. Turn on the water supply to flush the valve body and supply line. Turn off the water.
- 3
  Clean any debris away from the valve seat at the bottom of the valve body hole using a paper towel. Turn the top of the filler valve upside down and examine the rubber seal. Clean any debris or deposits from the seal with a paper towel.
- 4
  Reinstall the top of the valve by placing it on the valve body and turning it clockwise while lifting up on the float arm. Put the cover back on the tank. Turn on the water. Flush the toilet to see if the valve still whistles. If the noise persists, replace the filler valve.

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Plumbing