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Flush Out a Fill Valve on a One-piece Toilet

  1. Turn off the water supply to the toilet.
  2. Rotate the large white cap 1/8 turn counterclockwise (Fig. 1).
  3. Remove the rubber seal (diaphragm) from the cap and rinse it under running water to clear debris that may have collected. 
  4. Inspect the rubber seal for damage (tears, holes, etc.) that may keep diaphragm seal from properly sealing (Fig. 2).
  5. Turn the water supply on so that the water slowly comes out of fill valve. Keep water on for approximately 20-30 seconds to wash out any debris from inside the fill valve.  TIP: Hold a disposable cup over the uncapped fill valve to avoid splash from the fill valve if the water is turned on too high (Fig. 3).
  6. Turn off the water supply.
  7. Reinstall the rubber seal inside the fill valve cap. The nipple on the seal should go in towards the white cap (Fig. 4).
  8. Reinstall the cap by pushing it onto the fill valve and turning 1/8 turn clockwise until you hear a "click" (Fig. 4).
  9. Turn on the water supply to the toilet.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

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