Learning How to Replace Fill Valve in 11 Steps



Step 1. Turn off the Water

The fill valve, which is the toilet part that sits inside the tank that sends water to the bowl and replenishes the tank each time you flush, helps keep your toilet running efficiently. However, after some time it can become misaligned or worn, which can cause fill valve leaks or your toilet to run constantly, which can also increase your water bill.

Fortunately, replacing the fill valve is simple and affordable and can be done on your own with the following tips on how to replace fill valve.

The first step to how to replace fill valve is to turn off the water. To do so, simply find the shutoff valve located on the lower wall behind the toilet and then turn the valve handle clockwise to stop water flow to the tank.

If the valve handle is too tight, then use a wrench to loosen the handle and then finish turning the valve by hand.

Next, flush the toilet to drain the tank. After draining the tank, use a towel or sponge to remove any water that remains. If the tank is too full, simply wait until you disconnect the supply line and then allow the excess water to empty into a bucket.

If you are also replacing the supply line, then using an adjustable wrench, loosen the nut located at the bottom of the supply line.

Next, using adjustable pliers, loosen the nut located at the top of the supply line.

Once both nuts are loose, simply remove the supply line. Otherwise, simply loosen the nut located on the tank to remove just the top of the supply line.

There are two types of fill valves: a float ball system and a float cup system, so be sure to check which type of fill valve system your toilet uses before purchasing a new one.

To remove the fill valve, completely unscrew the loosened supply line nut from the underside of the tank. Place a small pan or bucket below the tank to catch any remaining water in the tank. Once you have removed the nut, then lift the fill valve to detach it. Place the old fill valve into the bucket as well as it may continue to leak water.

Next, increase the collar length on the new fill valve until the indicator on the top of the valve extends at least one inch higher than the overflow tube.

Step 2. Drain the Tank

Once the new fill valve has been modified, place the valve into the opening of the tank with the float positioned towards the center of the tank.

With the new valve in place, press down on the valve shank, and using a wrench, screw the nut onto the bottom of the tank about a half to three-quarters of a turn so that it can still be removed by hand. Once the tank is filled with water, you can always adjust the nut later if need be.

Step 3. Remove the Supply Line

Once you have the fill valve in place, next connect the refill tube inside the tank and then attach the adapter to the overflow.
Feel free to trim the refill tube if need be in order to avoid any entanglements.

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