Buying Guide: Toto Universal Flapper vs Korky Universal Flapper

Buying Guide: Toto Universal Flapper vs Korky Universal Flapper

Let’s dive into a comparison of the Toto THU500S Universal Flapper and the Korky 3" ADJ FLAPPER, considering their notoriety, pros, cons, and why homeowners might prefer one over the other.

Toto THU500S Universal Flapper

Toto is a well-established brand known for its high-quality plumbing products that have been trusted by consumers for decades. The THU500S flapper, a critical component for efficient toilet operation, is part of Toto’s reputable lineup. It is designed to ensure optimal performance and durability, reflecting Toto’s commitment to innovation and customer satisfaction. Whether you are upgrading your bathroom or repairing a fixture, Toto’s THU500S flapper is a reliable choice that upholds the brand’s standards of excellence.

The Toto Universal Flapper is crafted with Chlorazone red rubber, a material known for its durability and resistance to bacteria and harsh chemicals found in water treatment processes, such as chlorine. This ensures a longer lifespan and consistent performance in various conditions.

While it is labeled as "universal," it is important to note that this flapper is compatible with most, but not all, toilets. To assist users in determining compatibility and guiding them through repairs, Toto provides a comprehensive tool known as the Toilet Genius. This tool offers detailed, step-by-step instructions, making repairs straightforward and less time-consuming for users.

TOTO THU500S Universal Flapper


Korky is a trusted brand, known for its innovative toilet repair solutions that help homeowners easily fix common plumbing issues. Their products are designed to be user-friendly and reliable, ensuring peace of mind and a long-lasting fix for any toilet repairs needed.

The Korky 3" ADJ Flapper is highly regarded for the durability and reliability. Korky’s red rubber is designed to withstand harsh conditions, including exposure to chlorine, hard water, and other common water issues. The complete Korky repair kit offers a comprehensive solution, covering multiple parts necessary for toilet maintenance and repair. It fits most toilet models, addressing various issues from leaks to flushing problems, ensuring your toilet operates efficiently for a long time.

The Korky flapper is not considered the highest quality by some users. The primary issue lies in its specific design, which may not fit all toilet models, leading to compatibility problems for certain users. Additionally, it is more expensive than other options available on the market, which may not justify the cost for some consumers. While it does offer some advantages in terms of durability and performance for those it fits, the higher price point can be a significant drawback. Potential buyers might want to carefully evaluate their toilet model and budget before opting for the Korky flapper.



Toto’s reputation for quality ensures peace of mind for its customers. The Toto universal flapper comes with a 5-year warranty, which speaks volumes about its durability and reliability. Additionally, the universal fit of the product, combined with the smart help provided by Toto, makes installation a breeze for users. On the other hand, the Korky flapper is specifically designed to be ideal for areas with harsh water treatments. It serves as a cost-effective repair kit, although there are even cheaper options available on the market. The Korky flapper fits most toilets and effectively addresses common problems such as leaks and running toilets, making it a practical choice for many households. Both products demonstrate a commitment to quality and practicality, catering to different needs and preferences.

For homeowners seeking reliability, Toto’s THU500S offers peace of mind. Korky’s 3" ADJ FLAPPER, on the other hand, balances affordability and versatility. Consider your priorities and choose the one that best suits your needs!