Water-Saving Toilet Fill Valves and Flappers
Last reviewed September 2026NES Editorial, checked by the Billing & Compliance team
A running toilet can waste 200 or more gallons a day. The fix is usually a cheap fill valve or flapper, and NES MyReads catches the leak before the bill does.
Renter with a bill question? Pay my bill or call (800) 488-1748.
Why do toilet fill valves and flappers matter?
The flapper seals the tank and lets water out only during a flush, and the fill valve refills the tank afterward. A worn flapper or a stuck fill valve is the single most common cause of a running toilet, which can waste 200 or more gallons a day. Both parts are inexpensive, and replacing them on schedule prevents large, hidden water losses across a property.
Toilet fill valves
- Water efficiency, since a modern valve lets you set the tank to fill only to the level needed
- Consistent performance, for a reliable flush every time
- Quiet operation, so an upgraded valve runs silently
- Longevity, because a quality valve lasts longer and needs less maintenance
Toilet flappers
Flappers seal the tank between flushes, and a worn or ill-fitting flapper is the number one reason toilets run. Match the flapper to your toilet's flush-valve size, usually 2 inch or 3 inch, and choose a chlorine-resistant model so it lasts.
Common, reliable parts
Confirm compatibility with your toilet, and confirm with your property manager before buying. Examples owners often use:
- Adjustable universal fill valves
Models such as the Fluidmaster 400H are widely available and fit most tanks.
- Chlorine-resistant flappers
Models such as the Korky line resist breakdown from tank treatments and last longer.
- Correct flush-valve size
Measure the flush opening, usually 2 inch or 3 inch, before buying a flapper.
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Renter with a bill question? Pay my bill or call (800) 488-1748.