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7.5
Fluidmaster
Fluidmaster 502P21 Toilet Flapper
$6.29$9.56across 1 retailers
The Fluidmaster 502P21 PerforMAX Universal Water-Saving Toilet Flapper is a convenient choice for those looking to save water and fix running toilet issues quickly. While its easy installation is a major plus, pay attention to potential sizing and durability concerns, as these have been noted by some users. If water leakage is a persistent issue, consider consulting with a professional for an alternative solution.
Model: 502P21Color: RedUPC: 732454163351
Lowest at Amazon
$6.58 at AmazonLowest at any Popular Retailer
$6.58 at AmazonWhere to Buy
Prices last updated: April 23rd 2026 9:21 am
Product Score
Based on professional reviews and customer feedback
7.5/10
Overall
7.5
Consumer
Why this score?
The Fluidmaster 502P21 receives a moderate score due to its easy installation and effectiveness in stopping toilet leaks, which many users praise. However, several customers report durability issues, with some flappers failing after less than a year, leading to mixed opinions regarding long-term performance.
8+ Excellent6-8 Good4-6 Average<4 Poor
Score
The Fluidmaster 502P21 receives a moderate score due to its easy installation and effectiveness in stopping toilet leaks, which many users praise. However, several customers report durability issues, with some flappers failing after less than a year, leading to mixed opinions regarding long-term performance.
7.5/10
Overall
Pros
- •Easy to install, making it a quick solution for DIY projects.
- •Efficient at stopping phantom flushing, reducing unnecessary water use.
- •Recommended for wateaving performance, helping you cut down on water bills.
Cons
- •Some users report issues with water leaking, which might require further adjustments or replacements.
- •The size is found too small by certain users, indicating it may not perfectly fit all toilets.
- •Concerns about durability and quality, with some reviews noting it does not last as long as expected.
Bottom Line
The Fluidmaster 502P21 PerforMAX Universal Water-Saving Toilet Flapper is a convenient choice for those looking to save water and fix running toilet issues quickly. While its easy installation is a major plus, pay attention to potential sizing and durability concerns, as these have been noted by some users. If water leakage is a persistent issue, consider consulting with a professional for an alternative solution.
What Reviewers Are Saying
Praised
easy to install29%
stopped the phantom flushing5%
Criticized
water leaking19%
too small10%
low quality5%
not durable10%
Customer Ratings
4.619,282 reviews
5
75%
4
14%
3
6%
2
2%
1
3%
Based on 19,282 reviews from Amazon
Professional Reviews
Common Questions
The Fluidmaster 502P21 PerforMAX flapper is pretty versatile and should fit most toilets that use a 2-inch flush valve. But although it's labeled as 'universal,' it's not guaranteed to work with every...
Read full answer📚More About Fluidmaster 502P21 Toilet Flapper
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TLDR Review: Fluidmaster 502P21 Toilet Flapper
The Fluidmaster 502P21 receives a moderate score due to its easy installation and effectiveness in stopping toilet leaks, which many users praise. However, several customers report durability issues, with some flappers failing after less than a year, leading to mixed opinions regarding long-term performance.
TLDR Review·1 years ago
7.5
Overall
🚽
Does the Fluidmaster 502P21 PerforMAX toilet flapper fit all toilets?
Q&A·1 years ago
💧
How long does the Fluidmaster 502P21 PerforMAX toilet flapper last?
Q&A·1 years ago
🔧
Is the Fluidmaster 502P21 PerforMAX toilet flapper easy to install?
Q&A·1 years ago
Discussion
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