Sterling Toilet Flapper Replacement: Which One Is Best For You?

If you are a homeowner, you probably know the frustration that comes with a running toilet. Not only is it an annoying sound, but it can also waste a significant quantity of water and raise your utility bills.

In many cases, a running toilet is caused by a faulty flapper, the rubber seal that controls the flow of water from the tank to the bowl. If you have a Sterling toilet, finding a suitable flapper replacement can be exhausting.

It can be overwhelming to choose the right one, especially if you are not familiar with the technical details of your toilet. Additionally, many people are afraid of making the wrong choice and causing further damage to their plumbing system.

In this article, I will help you navigate the world of Sterling toilet flapper replacements and find the one that is best for you.

Comparison Factors Between The Best Replacement Options

Comparison FactorsDanco 88246Korky 100BPFluidmaster 502P21
CompatibilityKohler & SterlingMost 1.6 and 3.5 GPF toiletsMost 2-inch flush valves
Flush EfficiencyStandardHigh-performanceHigh performance with PerforMAX technology
Adjustable DialNoNoYes
Water ConsumptionUpto 1.5 gallons1.6 – 3.5 gallons2 gallons or less
Positive SealYesYesYes
Easy InstallationYesYesYes
Longevity4-5 years4-5 years5+ years

Product Review 1: Danco 88246 Toilet Tank Flapper


  • Made with durable rubber material to ensure long-lasting performance.
  • Compatible with specific Kohler and Sterling toilet models, including the Wellworth Lite and Windham models.
  • Specifically designed to work with low-consumption toilets to help you save water.
  • Simple and easy installation process lets you quickly replace your old or worn-out flapper and restore your toilet’s optimal performance.
Durable rubber construction.

Designed for low-consumption toilets.

Positive seal eliminates running toilets.

Easy installation.
May not fit all Kohler and Sterling toilet models.

Some users reported leakage issues after some time.

May not last as long as other flappers on the market.
Danco 88246 Toilet Tank FlapperPrice
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Product Review 2: Korky 100BP Ultra High-Performance Flapper


  • The flapper has a universal design that fits most 3-inch flush valves, making it a versatile option for various toilet models.
  • It is crafted with chlorine-resistant materials to ensure long-lasting durability and resistance to wear and tear.
  • The flapper features an adjustable dial that allows you to customize your water usage and save on your water bills.
  • It is engineered to provide a powerful and consistent flush that effectively clears the bowl.
  • The installation process is quick and easy, requiring no tools for hassle-free setup.
  • This flapper is made in the USA with high-quality materials to ensure reliable performance and quality craftsmanship.
Universal design fits most toilets.

Made with long-lasting, chlorine-resistant rubber.

Can fit both 2-inch and 3-inch flush valves.

Performs well in low and high-pressure systems.

Easy to install with incorporated instructions.
Some users report occasional issues with the flapper not sealing properly.

Rubber material may degrade faster in areas with high chlorine levels.

May require occasional adjustment to maintain optimal performance.
Korky 100BP Ultra High-Performance FlapperPrice
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Product Review 3: Fluidmaster 502P21 PerforMAX Flapper


  • The toilet flapper features a universal design that can fit most 2-inch flush valves, making it compatible with a wide range of toilet models.
  • It is made with high-quality silicone material that offers long-lasting performance, ensuring that you don’t need to replace the flapper frequently.
  • The PerforMAX technology used in the flapper provides a powerful and efficient flush, allowing you to save on your water bills while still maintaining the cleanliness of your toilet bowl.
  • The flapper also has an adjustable dial that allows you to customize the amount of water used per flush, ensuring that you have full control over your water usage and savings.
  • The installation process is easy and straightforward, with no tools required, making it convenient for you to replace your old flapper with this new one.
  • The longest-lasting flapper design ensures that you won’t need to replace your toilet flapper for a long time, giving you peace of mind knowing that your toilet will continue to perform at its best.
Long-lasting durability with a 7-year warranty.

Reduces water usage with adjustable water levels and leakage prevention.

Universal design compatible with most toilet models.

Easy installation with simple instructions.

Smooth and quiet operation.
Some users reported difficulty fitting the flapper onto certain toilet models.

May not fit older or unusual toilet models.

More expensive than some other flapper options on the market.
Fluidmaster 502P21 PerforMAX FlapperPrice
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Signs That You Need To Replace Your Sterling Toilet Flapper

Flappers are an essential part of your toilet’s system and can wear out over time, leading to leaks and other problems.

By replacing your flapper, you can help ensure that your toilet is running efficiently and saving water, which is not only better for the environment but can also save you money on your water bill.

Here are some signs that indicate that your sterling toilet flapper needs replacement.

Water Keeps Running

If you notice that the water keeps running in your toilet even after you’ve flushed it, it could be a sign that your flapper is worn out and needs to be replaced.

This is because the flapper is responsible for sealing the toilet tank and preventing water from continuously flowing into the bowl.

Difficulty Flushing

If you’re experiencing difficulty flushing your toilet, such as having to flush multiple times or using excessive force, it may be due to a faulty flapper.

This could be caused by a flapper that’s either too old, damaged, or hardened over time, causing it not to work properly.

Visible Damage

Another sign that your Sterling toilet flapper needs to be replaced is if there is visible damage to the flapper.

Cracks or tears in the rubber can cause water to leak into the bowl, leading to water wastage and higher water bills.

Water Discoloration

If you notice that the water in your toilet bowl is discolored, it could be a sign that the flapper is no longer functioning correctly.

Water discoloration could also be caused by other factors, such as a clogged pipe or corroded flush valve, so it’s important to have a plumber diagnose the issue.

Age of The Flapper

If you have never replaced your Sterling toilet flapper and it has been in use for several years, then it’s time to consider a replacement.

Over time, flappers can lose their flexibility and become less effective at sealing the toilet tank.

Water Leaks into The Toilet Bowl

If you notice water constantly running or trickling into the toilet bowl, it could be due to a faulty flapper.

The flapper is accountable for sealing the tank and controlling water from flowing into the bowl when the toilet is not in use.

A damaged or worn-out flapper may fail to seal the tank, resulting in water leakage.

How To Replace Your Sterling Toilet Flapper: A Complete Guide

Here is a step-by-step guide on how to replace your Sterling toilet flapper:

Tools Required

  • New Sterling toilet flapper
  • Scissors
  • Wrench or pliers
  • Sponge or rag

Step 1: Turn Off The Water Supply

Locate the water supply valve behind the toilet and turn it off. This will prevent water from flowing into the tank while you work on replacing the flapper.

Step 2: Remove The Old Flapper

Remove the old flapper by disconnecting it from the overflow tube and unhooking it from the chain connecting to the toilet handle. You may need to use a wrench or pliers to loosen any nuts or bolts holding the flapper in place.

Step 3: Clean The Area Around The Flapper Seat

Use a sponge or rag to clean the area around the flapper seat to remove any debris or buildup that may prevent a good seal with the new flapper.

Step 4: Cut The New Flapper To Size

Most Sterling toilet flappers come in a universal size that can be adjusted to fit your toilet. Use scissors to trim the new flapper to the size of your old flapper.

Step 5: Install The New Flapper

Attach the new flapper to the overflow tube and connect it to the chain that connects it to the toilet handle. Make sure the flapper sits flush against the flapper seat to create a tight seal.

Step 6: Turn On The Water Supply

Turn on the water supply and fill up the tank. Flush the toilet a few times to make sure the new flapper is working properly, and there are no leaks.

Congratulations! You have successfully replaced your Sterling toilet flapper.

What Causes Your Sterling Toilet Flapper To Get Damaged?

When it comes to toilet flappers, there are a number of factors that can lead to their damage or malfunction. Here are some of the most common causes of damage to your Sterling toilet flapper:

  • Age: Over time, even the highest quality toilet flappers will begin to wear out and break down. This can cause them to become less effective at sealing the toilet tank and allowing water to flow through the system as it should.
  • Hard water: If you live in an area with hard water, the minerals and deposits in your water supply can build up on your toilet flapper and cause it to become stiff or brittle. This can lead to leaks and other issues in the future.
  • Chemicals: Many household cleaners contain harsh chemicals that can damage your toilet flapper if they come into contact with it. If you use these cleaners in your toilet tank or bowl, be sure to flush the system thoroughly afterward.
  • Poor installation: If your toilet flapper is not installed correctly, it can become damaged or malfunction over time. Ensure to follow the manufacturer’s manual carefully when installing a new flapper.
  • Flushing non-degradable items: Flushing items such as wipes, feminine hygiene products, and other non-degradable materials can cause your toilet flapper to become damaged or clogged. This can cause leaks and other problems over time.

By understanding the common causes of damage to your Sterling toilet flapper, you can take steps to prevent these problems and keep your toilet running smoothly for years to come.

Additional Maintenance Tips For Sterling Toilet Flapper

Proper maintenance of your Sterling toilet flapper can help extend its lifespan and avoid unnecessary replacements. Here are some additional maintenance tips to keep in mind:

  • Over time, mineral buildup can accumulate on the flapper, causing it to deteriorate. To prevent this, clean your toilet tank regularly using a mild cleaning solution.
  • Chemicals such as bleach and chlorine can damage the flapper and cause it to deteriorate. Use gentle cleaning solutions and avoid pouring chemicals directly into the toilet tank.
  • The chain that connects the flapper to the flush handle should have some slack but not be too long. If the chain is too long, it can get caught under the flapper, preventing it from sealing properly.
  • A leaking toilet can cause the flapper to deteriorate quickly. Check for leaks by adding a few drops of food coloring to the toilet tank and waiting for 15-20 minutes. If the water in the bowl changes color, you have a leak that needs to be fixed.

By following these easy maintenance tips, you can extend the life of your Sterling toilet flapper and avoid the need for frequent replacements.

Bottom Line

If you have a Sterling toilet, choosing the right flapper replacement can be overwhelming. However, by understanding the technical details of your toilet and comparing options, you can find the right one.

In this article, We reviewed three popular options for Sterling toilet flapper replacements – Danco 88246, Korky 100BP, and Fluidmaster 502P21.

While each product has its own unique features, Fluidmaster 502P21 offers a universal design and durable silicone material, reducing water usage with adjustable water levels and leakage prevention.

It is also the longest-lasting option with a 7-year warranty, giving you peace of mind knowing that your toilet will continue to perform at its best.


What are the numbers on a toilet flapper?

A toilet flapper usually has numbers marked on it to indicate different water volume settings. The numbers typically range from “1” to “9”, with “4” being the standard setting. Rotating the flapper body to “1” will result in the quickest flush and lowest water volume, while rotating it to “9” will provide the most extended flush and maximum water volume.

How do I know what size flapper I need?

To determine what size flapper you need, examine the flush valve drain opening at the bottom of your toilet tank. If the opening appears to be roughly the size of a baseball or orange, then you’ll require a 2-inch flapper. Conversely, if the opening appears to be around the size of a softball or grapefruit, then a 3-inch flapper will be necessary.

Why does my toilet flapper close so fast?

The issue of a toilet flapper closing too quickly is typically due to excess slack in the lifting chain that connects the flush lever to the flapper.

When the chain is too slack, it cannot raise the flapper enough to let all the water flow through the flush valve. This causes the flapper to close prematurely, interrupting the flush.