Next, you’ll want to bring that flapper with you to a hardware store so you can buy one that is the same shape and dimensions as the one you’re replacing. To do this, unhook the sides from the pins at the bottom of the overflow tube (that’s the one in the center of the tank). First you’ll want to remove the existing flapper. If you’ve determined that a faulty flapper is the cause behind your running toilet, replacing it should be an easy do-it-yourself fix. How do I fix a toilet that keeps running? Once done, flush the toilet to determine if that fixed your issue. Once you have the replacement in hand, do the above steps in reverse to install, then adjust the float to your desired water level. You should then be able to pull the old fill valve up and out of the tank so you can bring it with you to the hardware store to make sure you purchase a new fill valve that is the same size. With the water supply off and the tank drained, unscrew the water supply line, located outside of the tank, by unscrewing the lock nut with a pair of pliers. It can become dirty or brittle over time, and may need replacing every few years. If the above fixes don’t work, you may need to replace your toilet’s fill valve, typically located to the left of the overflow tube. Inside you’ll should see the main parts responsible for your toilet's water control: the flapper chain, flapper, overflow tube, a ball float or float cup, and fill valve. There should be a shutoff valve or knob at the rear of your toilet, typically on the wall or floor. First, you’ll want to shut off the main water supply. You won’t need any special tools to figure out why your toilet is running, just your eyes, ears, and a set of hands. How do I diagnose why my toilet is running? In rare cases, a running toilet may be due to a crack in the toilet tank, but this is something that you should be able to spot visually, since water will pool on the floor around the bowl or beneath the tank. “If you’re hearing these sounds, whether it be constant or every hour, it may be a sign of a bigger issue with your toilet.” The cause of your noisy toilet? Either the float cup is positioned at the incorrect height, the chain on the toilet flapper has an issue, or the flapper seal or fill valve needs to be replaced. “Unless the toilet has just been flushed, you should not be hearing any indication of running water,” Reinhart says. As the toilet flapper seals off the water to the bowl, the toilet fill valve (also called a ballcock) allows water to flow into the toilet tank, filling it up for the next flush. As the water moves from the tank to the toilet bowl, the flapper slowly sinks down and rests on the flush valve. This allows the water from the tank to empty into the bowl and push the waste down the toilet. When you press down on a toilet’s flush lever, the rubber flapper (also called a flat valve) raises inside the toilet tank.
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