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Shut off the water supply
In any toilet repair, the first step is always to turn off the water supply. Locate the shut-off valve at the back of the toilet and turn it clockwise.
Clear out water in the toilet tank
After the supply has been cut, flush the toilet then open the tank lid and clear out the remaining water using a sponge until the tank is empty. This will ensure that you don’t wet your floor as you proceed through to the other steps.
Remove the fill valve
Unscrew the inlet hose from the bottom of the tank then remove the back nut that holds the fill valve in position. After doing this, the fill valve should loosen up and be easy to remove from the tank. Remove it and also remove the flush handle, then proceed to the next step.
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Separate the tank from the bowl
Getting rid of the fill valve and flush handle gives you more space to unscrew the tank from the bowl. Using a heavy-duty screwdriver, undo the two screws and nuts that secure the tank to the bowl, then lift the tank and place it aside.
Remove the gasket between the tank and bowl
Removing the tank from the bowl should expose the gasket that seals the waterway between the two parts. Remove this gasket and use a flat head screwdriver or a similar sharp object to scrape off the gasket bits that remain attached to the bowl.
Install a new flush valve
Below the tank, unscrew the back nut that holds the old flush valve and remove it. Install a new one and secure it in position using its back nut. Next, fit a new rubber gasket in the threaded part of the valve that protrudes down below the tank.
Reseat the tank on the bowl
With the rubber gasket in place, reseat the tank back to the top of the bowl and make sure that the gasket falls squarely above the bowl’s water intake so that it forms a tight seal.
Next, secure the tank to the bowl using screws and nuts, and ensure you include rubber washers in between to prevent any leakages.
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Install a new flush handle
The final piece of the gut that should be replaced it the flush handle. Simply fit a new one to its slot, secure it using a back nut and attach the chain from the flapper to the appropriate position on the handle.