Flush valve seal too tight - Mansfield Plumbing Products Mansfield QUANTUM White Round Front Pressure Assist Two-piece Toilet with S

Just go to Lowes and get a replacement KIT. They are not costly and they are easy to install.

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.

Was the flapper chain adjusted properly? If too tight it will not sit flat to close the hole. If too loose will not flush properly. Also check the rim where the flapper valve closes for any cracks, nicks, flat or broken spots. Any of those will keep the flapper from sealing.

With lid removed, look down into it and remove and replace the black rubber thing in the center. This is the flush valve and is worn to the point where is no longer provides a tight seal allowing water to pass and run into bowl. Also, could be something underneath it not allowing it to seat properly.

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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Toilet runs continuously or doesn't flush adequately

Jiggling the handle might work for a while, but if your toilet is always running or doesn't flush adequately, you need to perform these simple fixes that usually can tame a noisy, inefficient toilet.

Check the Chain

The chain attached to the rubber flapper often becomes loose, causing incomplete flushing and/or continuous running. To fix it, remove links from the chain using needle-nosed pliers until it's tight.

Check Water Level

Improper water levels can also cause problems with your toilet. This can be fixed by adjusting the ball ****, which is located next to the overflow pipe, the open tube to the right of the handle. Adjust the ball **** so the water comes to ½ " below the overflow pipe.

Clean the Surface of the Flush Valve

A continuously running toilet can also be the result of a faulty flush valve. Because the valve is made of rubber, it can decompose or warp allowing water to escape from the tank into the bowl. Clean the sealing surface to see if this will improve the seal. If too decomposed or warped the valve may need to be replaced.

Replace the Flapper

Remove old flapper and replace with a suitable replacement. Attach the flapper to the overflow pipe inside the bowl. Then attach the lever chain from the flapper to the handle lever making sure the chain is taut.

This video will help familairaize you with the flushing mechanism and the repair:

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

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