






Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to KUWAIT.
🚽 Upgrade your flush game—save water, save money, and never ghost flush again!
The Fluidmaster 502P21 PerforMAX is a durable, adjustable toilet flapper designed for 2-inch flush valves. Featuring a corrosion-resistant solid frame with Microban antimicrobial protection, it fits most high-efficiency toilets (1.28 to 3.5 gallons per flush) and offers easy installation in under 10 minutes. Its adjustable dial optimizes flush efficiency to reduce water waste, backed by a 5-year warranty for long-lasting performance.



| ASIN | B000BVS3H0 |
| Best Sellers Rank | #19,628 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #21 in Toilet Flappers #1,799 in Kitchen & Bath Fixtures |
| Brand | Fluidmaster |
| Brand Name | Fluidmaster |
| Connector Type | Mechanical |
| Customer Reviews | 4.6 out of 5 stars 20,102 Reviews |
| Exterior Finish | Metal |
| Global Trade Identification Number | 00039961005021 |
| Included Components | Product Only |
| Inlet Connection Size | 2 Inches |
| Inlet Connection Type | Barb |
| Item Dimensions | 4.9 x 3.5 x 3.5 inches |
| Item Type Name | toilet-replacement-parts |
| Item Weight | 22.68 g |
| Item dimensions L x W x H | 4.9 x 3.5 x 3.5 inches |
| Manufacturer | Fluidmaster |
| Manufacturer Part Number | 502P21 |
| Manufacturer Warranty Description | 5 year warranty |
| Material | Rubber |
| Material Type | Rubber |
| Model Number | 502P21 |
| Number of Pieces | 1 |
| Outlet Connection Size | 2 Inches |
| Outlet Connection Type | Flange |
| Size | 1 Pack |
| UPC | 039961005021 |
| Unit Count | 1.0 Count |
| Valve Type | Flapper |
X**L
works well, no leak
fits the TOTO toilets at home. replaced two cracked leaky valves, no more leaks!
B**G
Who is running?
I recently had an issue with my toilet running and was unable to get a plumber to come out and take a look at it. However, I was determined to find a solution to the problem and after some research, I stumbled upon a product that could potentially help me fix the issue - the Toilet Flapper. I decided to give it a try and was pleasantly surprised by the results. The product was easy to install and worked like a charm. I no longer hear the annoying sound of running water all day and my toilet has been working great ever since. Overall, I am very pleased with the Toilet Flapper and would highly recommend it to anyone who is experiencing similar issues with their toilet. It's a great product that does exactly what it's supposed to do and has saved me the hassle of having to deal with a plumber.
M**N
GREAT REPLACEMENT!
I have become quite the plumber, thanks to YouTube videos. My fill valve and flapper had gone bad and my toilet was making a funny scary sound after every flush. I ordered the full set but the valve that came with the fill valve was not heavy enough to stay down after every use. I got tired of reaching in and pushing it down all the time so I purchased this flapper hoping it would be better and it was. This particular model has a better chain than the one that comes complete with the valve. This one works perfectly and I have since bought a second one for my other bathroom. The price is great, it's easy to install and works exactly as it should. It also has a dial that you can turn, to use more or less water. Great product and I highly recommend.
J**H
It isn't sealing completely
My toilet USED to have an annoying little trickle, but otherwise it worked fine. I, being a genius, decided to "fix" it. I decided to replace the flapper with a brand new one, and this new flapper works fine - as long as I hold it down with my finger. As soon as I let go, the flapper starts letting water into the bowl. It's a seal; it should seal properly. That was my one expectation of this product. On the plus side, the installation was very easy. e: I weighed it down with some nickels and let it sit overnight, and it seems to be sealing completely now. I'm not sure what made the difference.
A**L
Ingenious setting of gal per flush
It installs easily and quickly. The only problem I had was the chain was too short to reach the handle arm. I wish they would have made the length adjustable. But I was very happy with the ability to adjust how much water it allows to flow before the flapper closes. It is a pretty ingenious way it works. By just turning the top of the flapper it somehow changes how soon the flapper drops to close the water flow. I had a tough time to decide on 4 or 5 star. 4 star for the chain shortness which added time for installation to connect old chain to the chain which came with it, but 5 star for how well it works and ease of installation.
T**6
Bye bye poop
Fit and works well.
G**G
Highly Recommended – Easy Fix That Works Like a Charm!
I recently purchased the Fluidmaster 502P21 PerforMAX Toilet Flapper to fix a constantly running toilet, and I couldn’t be happier with the results. Installation was a breeze — I had it swapped out and working in under 10 minutes without any tools or plumbing experience. The instructions were clear, and the solid frame design made it easy to align and secure in place. One of the best features is the adjustable dial, which allowed me to fine-tune the flush rate for better water efficiency. After making a few quick adjustments, I noticed an immediate reduction in water usage without sacrificing flushing performance. It's a great water-saving solution that’s both affordable and effective. The build quality is impressive too. The flapper feels durable and well-made, with a strong seal that eliminated the leaks I was dealing with. Plus, it fits standard 2-inch flush valves, so it’s truly universal for most toilets. Overall, the Fluidmaster 502P21 is a small investment that delivers big results. If you're dealing with a leaky or inefficient toilet, this is a simple, reliable upgrade that can save water and money. Highly recommended!
G**M
Not Chlorine resistant
Lasted about 7 months before chlorine tablets messed them up. Not very chlorine-resistant compared to the original from the manufacturer, which lasted several years.
I**E
Works perfectly!
It is exactly as depicted. The plastic is fairly thick for what it is, so considering its placement I think it will last a very very long time. The one we had prior was entirely made of rubber and it had sagged and torn over time, leaving an endless flow of water that racked up an extra $50/m on our city bill. Putting this on was SUPER easy, I am a woman (and certainly not a plumber) and I had no problem clicking it into place or attaching the chain to the lever. I love the price, very fair. As mentioned, the top cap is plastic, but I find that beneficial. Firstly, it will not sag as the old one did. Secondly, it makes movement easy, as its quick to lift and quick to drop. Mind you this toilet is in my young children's room, so they need something that doesnt require excess effort to flush. Highly recommend.
A**A
Buen producto
Le quedo muy bien al tanque de agua . No hemos tenido problemas , fácil instalación
T**T
So many DIY jobs become a pain - this was easy and 100% effective
I recently found that there was a constant trickle of water from the toilet cistern into the pan. The cistern has a Fluid Master flapper valve that I fitted in 2011 and I noticed that when it was in the shut position it wasn't forming a water tight seal any more. After lots of fiddling about and no success (in fact, I ended up making things worse so that the trickle became a proper flow!), I discovered through blogs that the flapper mechanism often become distorted after typically 5 years of use and need to be replaced. There's no need to replace the whole flush mechanism, just the red valve. I ordered a replacement flapper valve and installed it within 10 minutes (the bit that took longest was fiddling to get the chain to the right length). Note that Fluid Master produces 3 variants of the flapper valve - the one I needed was a 502, so should you need to replace yours please just check that yours looks the same as this one; if not, it could be a 501 or 504 variant.
D**L
Works Perfect
Works perfect, fixed my problem. Has a dial on it to re-size and be universal.
M**B
I purchased and paid for two items but only received one items in the post.
As above, I still wait for the second unit which I don't think will arrive now. The unit is very good, fits our cistern with ease and furthermore, works very well. Delivered 2 Jul 2020 (One Item only) Fluidmaster 502P21 Adjust-A-Flush, Red, 2 in £16.56 Buy it again View your item
Trustpilot
1 month ago
2 weeks ago