How to Adjust Dual Flush Toilet

How to Adjust Dual Flush Toilet: Simple 5 Steps

You know that dual flush toilets are more water-efficient, but it can be hard to adjust the valve so you get the right amount of water each time.

It may seem like an easy job, but the reality is that it's not always as simple as turning a knob or pulling a lever.

We'll tell you how to adjust your toilet's dual flush valve in just five steps. You'll also find out what dual flush mechanisms do.

The 5 Simple Steps for Adjusting a Dual Flush Toilet

Dual flush toilets are more environment-friendly than standard toilets because they use less water. With high-quality dual flush toilets, you can save 67% of the water that you would use with a regular toilet.

Adjusting a Dual Flush Toilet

The following 5 steps will show you how to adjust the dual flush valve on your toilet:

Step 1: Open the Dual Flush Toilet Lid

The first step is to open the dual flush toilet lid. You'll find the lid on top of the tank. Find out if your toilet has a single or double button so you know which side of the tank to lift.

Open the Dual Flush Toilet Lid

Or you can see two buttons or levers inside a small hole in the center of the tank's lid. Sometimes the button or lever resembles a handle, and other times it may be circular or square-shaped.

Step 2: Adjust the Flush and Water Levels

The second step is to adjust the flush levels, which are typically marked on top of the tank. One button or lever will flush the toilet using less water, and the other button or lever will flush the toilet using more water.

Adjust the Flush and Water Levels

Ensure that the level of the water in the tank is just below the top of the overflow tube. You may need to adjust the water level if your toilet flushes too much or not enough.

Step 3: Tighten the Screw

The third step is to tighten the screw that you'll find on the upper side of the flush level. This ensures that there is no more movement between the flush lever and handle assembly.

You may also want to tighten the screws on any other levers that move during a flush.

Step 4: Flushing the Toilet

The fourth step is to flush the toilet. If it flushes too much or not enough, you'll need to adjust the water level accordingly.

Flushing the Toilet

Sometimes you'll need to adjust the water level until your toilet works perfectly. Other times it may take no adjustment at all. And if the toilet turns on when you only want it to flush, then you knows that there is too much water in the tank.

Step 5: Finalizing the Toilet Adjustment

The fifth and final step is to check the flushing action. Push the flush handle and see if it works correctly. If there are still problems with the flushing mechanism, then you may need to adjust the dual flush valve again.

Once you've mastered this simple change, your dual flush toilet will work perfectly every time.

Finalizing the Toilet Adjustment

Now that you know how to adjust your dual flush toilet, you can save water and money each time you use it. Dual flush toilets are becoming more and more popular every day, so it's important to understand how they work.

What Dual Flush Toilets Do?

In a standard toilet, all of the water is used to flush the toilet. This can use up to 1.6 gpf. A dual flush toilet uses 1.28 gpf water by splitting the flushing action into two different steps.

What Dual Flush Toilets Do

The following mechanisms make dual flush toilets more water-efficient:

Valve Assembly, Push Button or Handle

This is what triggers the flushing action. When you press the button or pull the lever, it sends water to the bowl to flush the toilet.

Push Button or Handle

The Toilet Fill Valve

This is the part of the toilet that fills the tank with water. It's activated by the flapper valve and chain, which opens when you flush the toilet.

The Toilet Float Bowl

This is the part of the toilet that monitors how much water is inside the tank. When it gets too low, it opens the fill valve and sends more water in to refill the toilet.

Toilet Float Bowl

Tube Refill

This is a special tube that connects the flapper to a small valve. When water leaves the tank from one side, it's sent through this tube and refilled on the other side without affecting the flushing action.

Tube Overflow

This is the part of the toilet that catches excess water and sends it back to the tank. It helps to prevent water from spilling over onto the floor.

Now that you understand how a dual flush toilet works, it's easy to see why they're so popular. They're not only water-efficient, but also easy to adjust, if you have knowledge about them, so they work properly.


If you're having any problems with your dual flush toilet, the best thing to do is adjust the valve. It's a simple adjustment that you can make yourself, and it only takes 5 to 10 minutes.

Remember to check the flushing action after you've made the adjustment, and tighten the screw if necessary. With a little bit of practice, you'll be able to adjust your dual flush toilet like a pro.

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