Relace flush valve seal - American Standard Cadet 3 Right Height Elongated Toilet by - ADA Compliant

A dual flush toilet is a fantastic option to save water and make your home more environmentally friendly. Giving you the option for a half flush or full flush at your discretion, you can lower your water consumption while still getting the job done. However, like all toilets, they can present problems that mean the toilet doesn't function as it should. One common problem in dual flush toilets is constantly running. You hear the tank constantly being filled, even when it should be finished and completely full. If your dual flush toilet is constantly running, first check for the top three problems that cause this trouble:
Flapper or Seal Trouble
The flapper or seal is often the culprit in constant running water in both normal and dual flush toilets. Over time, this rubber piece may become brittle or simply misaligned. To check it, turn off the water supply and flush the toilet to completely empty it of water. Remove any remaining water with a sponge or towel. Then, you'll need to remove the flush valve canister in order to access the seal. Once you've found the seal, check to see if there are any cracks in the seal. If there are, you'll need to replace it. Otherwise, check to see if it can be re-aligned to sit nicely in its place. Some homeowners find that applying a bit of Vaseline to the seal can renew it, making it supple and functional again for a while at least.
Debris
Sometimes the water supply isn't as clean as we think. Or, dust and dirt may be able to enter the toilet, causing the fill valve to malfunction. To check it, turn off the water supply and remove the lid from the fill valve. Then, look for any debris and remove it. You may also consider brushing out the valve with a small brush. Once you're certain it is clean, recap the valve and check if the problem has been solved.
Broken Zip Tie
The fill valve in most dual flush toilets has a zip tie to keep the base of the fill valve in place. If the fill valve isn't strongly secured, it can cause the toilet to run. Sometimes these ties wear out or break before the rest of the device does. You'll need to replace a broken zip tie with a new one if you find that it's broken. If possible, you can place two zip ties on the fill valve in order to assure that the base doesn't wobble, causing the leak. Many times these problems are easy for the average homeowner to check for and repair. In the case that you are not able to find a solution to your dual flush toilet's constant running, then you'll need to call in the help of a professional plumber. A high quality plumbing company will be able to help you troubleshoot your dual flush toilet troubles and make sure it's functioning properly again.

If there is water still running into the toilet bowl, there is a problem with your flapper or flush valve. The most common problem, and least expensive to fix, is the flapper has gone bad and is allowing water to escape past it. Replace the flapper and the water should stop running. If not, it is possible the flush valve or one of the seals holding it to the tank has gone bad and needs replaced. Try replacing the whole flush valve. They come in a kit that includes the valve, flapper, and seals.

It is most likely the flush valve gasket. This is the equivalent of a flapper on a normal toilet. You can purchase these seals at plumbingmall.com 750017 Outlet Valve Seal for M5 Flush Valve

The arm controls the Flush Valve. Inside the flush valve is a black rubber "seal" that closes the end of the fill pipe and stops the water. If a piece of sand, grit, or small rock gets imbedded in the seal it will allow water to pass through even when the tank is full. Either you take apart the flush valve and remove the grit, or you replace the whole valve. Sometimes even when the grit is removed the rubber seal is damaged and must be replaced. A new valve, and some of these replacement seals can be purchased at a good hardware or plumbing supply store. Use the valve handle, below the tank, on the pipe that comes through the wall, to turn off the water before replacing the seal or valve.

Did you replace the flush valve or the flapper?

There must either be a problem with the seal between the two surfaces of the flapper and flush valve or the flapper is being prevented by the flush system to returning to make a seal against the flush valve after the water completes draining during the flush cycle or more likely water is draining through the overflow tube.

Make sure the sealing surfaces are clean and not damaged.

Make sure the flapper is not being interfered with and is able to return to the closed position to make a complete seal against the flush valve.

Check adjustment of the water fill level to make sure the water is not filling above the water overflow. If the inlet valve does not shut-off when the level is adjusted to the proper level the water inlet valve may need replacing.

The following videos may prove helpful.


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Hi, you need new Mansfield 210/211 flush valves. They can be found on amazon.. here: Amazon com Mansfield 210 211 seal. I hope this helped you. Cheers

I don't know what you mean by "pumping" the tank. If the toilet runs, then either the fill valve is defective or the seal on the flush valve is defective. First, check to see that when you move the float, the toilet stops running. If it does not, then replace the fill valve. If it does, then inspect/replace the seal on the flush mechanism at the bottom of the tank. If this seal is bad, you can usually see water continuously flowing (slowly) into the bowl. You will see ripples on the surface of the water in the bowl.

Have you replaced the flapper? I've also had luck putting vaseline on the valve seal area. Good luck!

That is a tricky one. Tighten the tabs, twist into place, then tighten a bit more. They are a pain in the a$$, but with patience you will get it done. Good luck

if the white smoke is in the morning,only then it is valve seals and if it is through out the day as your driving the vehicle then the engine need over houling,(rings metal and main bearing in the engine need to be relace,including valve seal , top gasket,botom gasket and oil seal for proper perfomance.