How To Adjust Dual Flush Toilet Mechanism – Easiest Ways

Adjusting the dual flush toilet mechanism is vital for you in the long run. It would be best if you urgently had this mechanism’s adjustment.

Because it will prevent leakages in your toilet and save you from fixing its related damage cost. Additionally, its adjustment will even help you in saving water.

Toilets are one of the necessary accessories for our bathroom. Anyhow, they were invented centuries ago. Thus, they were perfected from the very first time. Moreover, the modern types have a lot of functions. 

For instance, dual flush toilets installed in our bathrooms are quite popular. Visit several websites about toilets, and you will see what I am saying for sure.

They are too good to be replaced with standard models that use only one flush for liquid and solid wastes. 

Standard flush toilets use between 8 and 13 gallons of water per flush. At the same time, Dual flush toilets reduce the volume of water used per flush, but only to 4 and 6 gallons.

This helps with your water bill and can help reduce the amount of sewage that needs to be pumped away and processed during rain events. 

Most dual flush toilets use 1.6 GPF (gallon per flush) or 1.28 gpf when flushing solid waste from the bowl and .5 GPF for liquid waste.

In addition, dual flush toilets have extra mechanisms to separate the internal workings of the dual flush mechanism, which can be challenging for homeowners who don’t have a toolbox.

This guide will help to know the easiest ways to adjust the flush toilet mechanism within no time. So without wasting further time, let’s begin this guide. 

What is the Toilet Flush Mechanism?

How to adjust dual flush toilet mechanism

Okay, so before going to our main topic, let me tell you about the toilet flush mechanism as it’s vital to know about the flushing mechanism to adjust it. 

The toilet flush mechanism is the part of your toilet that flushes the contents down the drain to keep your bathroom clean.

It consists of several components: a water supply line, a tank valve, a float ball, a valve assembly, and a flapper valve.

The water supply line connects to the wall and supplies water to the tank when you flush. The tank valve controls the water entering the tank from this line.

The float ball and valve assembly control how much water stays in the tank after it has filled up with water during each flush cycle. 

This is done by raising or lowering a float ball that rests on an adjustable rod connected to an overflow tube and drains back into your home’s plumbing system when it fills up completely.

A flapper valve closes off access to waste material inside the toilet bowl after each use.

Until it is flushed again by pushing down on its handle again, which opens this valve back up for another use afterward again.

As well as turning on its cold/hot water supply lines inside first before doing so again. So that we can wash ourselves off afterward as needed too!

Related Blog: how should the inside of a toilet tank look


How to adjust dual flush toilet mechanism

Dual flush toilets, also known as “gravity-assisted” toilets, are a type of toilet that uses less water than traditional toilets.

They do this using a dual-flush system: the first flush is for solid waste, and the second is for liquid waste. This means you won’t have to worry about clogging your toilet if you accidentally put in too much paper or other solids.

The dual flushing system uses a simple switch to divert either water from the tank or water stored in a separate tank. Pushing the button will release a small amount of water into the bowl and clear out any solid waste.

If you need more water for heavier waste, you can push the button again to release more water from the tank.

If you’re trying to decide between a dual flush toilet and a single-flush toilet, consider how many times per day you use your bathroom—if it’s only one or two times per day.

A dual flush toilet may be more cost-effective for you in terms of water and energy usage!

Related blog: How Does The Inside Of The Toilet Works

How To Adjust Dual Flush Toilet Mechanism – Easiest Ways

How to adjust dual flush toilet mechanism

Adjusting the dual flush toilet mechanism is a simple process that anyone can do. Here are some of the ways you can adjust it:


Adjusting the toilet float is a simple process that can be done in less than a minute. To adjust the toilet float, you’ll need to follow these steps:

1. Turn off the water supply to the toilet by turning off the valve on the wall behind your toilet tank.

2. Remove the lid from the top of your toilet tank and look for a lever or screw that controls how much water is in your tank. If there isn’t one, skip ahead to step 3.

3. If there is a lever or screw on your toilet’s water level control, turn it counterclockwise until it stops moving, then place it back on top of your tank.

4. Turn on your water supply again (by turning on the valve behind your toilet) and flush your toilet to make sure everything works properly before putting everything back together again!


The second way to adjust the dual flush mechanism on your toilet is to remove the fill valve.

First, turn off the water supply to the toilet and remove any hoses connected to it. If there are no hoses, unscrew the water shut-off valve at the base of your toilet’s tank.

Next, use a wrench to loosen and remove two bolts that attach the fill valve arm to its mounting bracket. Remove the fill valve arm from its bracket, then disconnect its plastic or metal float rod from its float ball.

Remove any washers between the fill valve arm and its mounting bracket or between the float rod and its float ball. You’ll find them inside those spaces where they’ve been hiding!

With these parts fastened together again, reattach them in their original positions using new washers as needed.

Or tighten their bolts as much as possible without stripping them—and reinstall all other parts that were removed during this process. Then turn on your water supply again and check for leaks.

Related blog: how to adjust toilet flush valve


And the last easiest way to adjust the dual flush mechanism on your toilet is to unclog the toilet drain/vent stack. But how can you do that? Here are the pro steps.

1. Turn off the water supply to your toilet and flush it to drain any water that may have accumulated in the tank.

2. Place a bucket underneath the toilet’s water supply valve (usually located on the wall behind or underneath the toilet) to catch any excess water leaking from the tank or bowl after turning off the valve.

3. Remove any debris accumulated in your toilet’s drain lines with an auger tool or snake-like wire device, then replace these parts if they are damaged or broken beyond repair.

4. If you cannot find a replacement for your old parts, contact an authorized service provider for advice on how best to proceed with installing new ones yourself!

Tips And Precautions For Adjusting A Dual Flush Toilet Mechanism

Adjusting a dual-flush toilet mechanism is relatively simple, but taking precautions is important to avoid injury and damage.

There are a few precautions when adjusting a dual flush toilet mechanism. 

  • You must ensure that the tank is empty of water before you begin your adjustments. 
  • Make sure the tank lid is closed and locked, so it doesn’t fall off while working on it. 
  • Ensure that all tools and materials are stored safely away from small children who might get inside the tank and use them as toys.
  • Always wear rubber gloves and protective eyewear when adjusting a dual flush toilet mechanism.
  • Always ensure that the water supply to the toilet is turned off before attempting any adjustment work on your dual flush toilet mechanism.
  • Ensure that all children and pets are kept from your work area while adjusting your dual flush toilet mechanism. They may be injured by moving parts of the device should they fail during adjustment procedures or malfunction after the installation has been completed successfully.
  • Check with someone from your local plumbing supply store before purchasing any parts for your toilet. You may want to get advice from them about what type of part you need for your particular model.
  • Make sure that all the parts are compatible with each other—if they’re not compatible, they won’t work together properly (and could cause damage).

Also Read:

Can Two Toilets Share The Same Vent

Can A Toilet Overflow Without Being Clogged

How to Flush a Toilet for Dummies


In the end, adjusting the dual flush toilet mechanism is a relatively easy task that any homeowner can accomplish with basic DIY skills.

By following these simple step-by-step instructions, you’ll be able to get your toilet back in working order in no time!

So don’t wait any longer – get started today and enjoy a clean bathroom.


Why is my dual flush toilet not flushing properly?

Possible Reasons:
1. Clogged trapway or flapper valve
2. Low water level in tank
3. Malfunctioning flush mechanism
4. Inadequate water pressure or supply

Do you press both buttons on dual flush toilet?

No, the small button is for liquid waste and the large button is for solid waste. Choose the appropriate button for each flush.

Are dual flush toilets adjustable?

Yes, some models have adjustable water levels, while others have adjustable flush buttons or mechanisms to customize water usage.

What is the purpose of dual flush?

The purpose of dual flush toilets is to conserve water by offering two flushing options for different types of waste, reducing water usage.

Are dual flush toilets good?

Yes, dual flush toilets are good for reducing water consumption and utility bills. They can also be eco-friendly and sustainable.

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