---
product_id: 48168641
title: "F502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 Pack"
brand: "fluidmaster"
price: "€ 37.75"
currency: EUR
in_stock: true
reviews_count: 8
category: "Fluidmaster"
url: https://www.desertcart.gr/products/48168641-f502p21-performax-universal-water-saving-long-life-toilet-flapper-2
store_origin: GR
region: Greece
---

# Adjustable flush volume 1.28-3.5 gal Universal 2-inch fit Corrosion-resistant Microban frame F502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 Pack

**Brand:** fluidmaster
**Price:** € 37.75
**Availability:** ✅ In Stock

## Summary

> 🚽 Flush Smarter, Save Water, Live Better!

## Quick Answers

- **What is this?** F502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 Pack by fluidmaster
- **How much does it cost?** € 37.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/48168641-f502p21-performax-universal-water-saving-long-life-toilet-flapper-2)

## Best For

- fluidmaster enthusiasts

## Why This Product

- Trusted fluidmaster brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Backed by 5-Year Warranty:** Confidence in durability with a half-decade warranty, making it a smart, sustainable upgrade.
- • **Customizable Water Savings:** Dial-adjustable flapper lets you optimize flush volume for maximum efficiency and reduced water bills.
- • **DIY-Friendly Quick Install:** Simple, tool-free installation in under 10 minutes—perfect for busy professionals who value time.
- • **Built to Last with Microban:** Corrosion-resistant solid frame resists bacteria, chlorine, and hard water damage for long-term reliability.
- • **Fits Most 2-Inch Flush Valves:** Universal design ensures seamless compatibility with high-efficiency toilets, eliminating guesswork.

## Overview

The Fluidmaster F502P21 PerforMAX is a universal, adjustable 2-inch toilet flapper designed for high-efficiency toilets using 1.28 to 3.5 gallons per flush. Featuring a corrosion-resistant Microban solid frame, it prevents leaks and breakdowns caused by bacteria and chlorine. Easy to install and backed by a 5-year warranty, it offers a reliable, water-saving solution that fits most standard flush valves.

## Description

Free delivery and returns on all eligible orders. Shop Fluidmaster F502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 Pack.

Review: 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.
Review: 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

## Features

- UNIVERSAL DESIGN: Adjustable flapper fits most 2-inch flush valve toilets and is ideal for use in high efficiency 1.28 to 3.5 gallons per flush toilets
- ADJUSTABLE TO SAVE WATER: Dial flapper adjusts for maximum flush efficiency and to save water
- CORROSION RESISTANT: Solid frame 502 2-inch flapper features corrosion-resistant Microban material to prevent breakdown and leaks due to bacteria and chlorine and is chlorine and hard water resistant
- International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000BVS3H0 |
| Best Sellers Rank | 198,278 in DIY & Tools ( See Top 100 in DIY & Tools ) 482 in Toilet Parts |
| Brand | Fluidmaster |
| Country of Origin | Mexico |
| Customer Reviews | 4.5 out of 5 stars 19,319 Reviews |
| Exterior Finish | Metal |
| Exterior finish | Metal |
| Global Trade Identification Number | 00039961005021 |
| Included Components | 502P21 ADJUST-A-FLUSH TOILET FLAPPER |
| Inlet Connection Size | 2 Inches |
| Inlet Connection Type | Thread |
| Inlet connection size | 2 Inches |
| Inlet connection type | Thread |
| Item Dimensions | 12.4 x 8.9 x 8.9 centimetres |
| Item Type Name | Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install |
| Item Weight | 0.05 Pounds |
| Item dimensions L x W x H | 12.4 x 8.9 x 8.9 centimetres |
| Item height | 3.5 inches |
| Manufacturer | Fluidmaster |
| Manufacturer Warranty Description | 5 year warranty. |
| Material | Rubber |
| Model Number | 502P21 |
| Outlet Connection Size | 3.5 Inches |
| Outlet Connection Type | Barb |
| Specification Met | CE, UL, WaterSense |
| UPC | 039961005021 |
| Unit Count | 1.0 Count |
| Valve Type | Flapper |

## Product Details

- **Brand:** Fluidmaster
- **Exterior finish:** Metal
- **Global Trade Identification Number:** 00039961005021
- **Inlet connection size:** 2 Inches
- **Inlet connection type:** Thread
- **Item dimensions L x W x H:** 12.4 x 8.9 x 8.9 centimetres
- **Material:** Rubber
- **Outlet connection size:** 3.5 Inches
- **Outlet connection type:** Barb
- **Specification met:** CE, UL, WaterSense

## Images

![F502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 Pack - Image 1](https://m.media-amazon.com/images/I/61luZUJw5EL.jpg)

## Questions & Answers

**Q: How do you tell which size you need?**
A: I just looked at it on amazon and because I have two toilets with these fitted it just looked right.
I did not know they came in sizes, I have changed one before, but got the whole unit just to get the flapper valve.
I was pleased when I saw amazon did just the flapper valve and half price of whole unit.
Sorry I cannot be any more help. It does say on the package that it is for 2" flapper units.

**Q: my old one is 2.5 inches across. Is this the same size please?**
A: The one I have is slightly bigger at 2.75 inches across but that shouldn't be a problem.

**Q: My toilets very old, pull chain type. Would this be the right one to buy?**
A: Agree with Fred’s comments. It would be a good modification to swap out the entire unit, but depending on the age of your high level cistern the whole down-pipe may also need changing as these were often lead jointed. Unless you are really good at plumbing, this is a job for a plumber.

## Customer Reviews

### ⭐⭐⭐⭐⭐ So many DIY jobs become a pain - this was easy and 100% effective
*by T***T on 10 November 2018*

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.

### ⭐⭐⭐⭐⭐ I purchased and paid for two items but only received one items in the post.
*by M***B on 13 August 2020*

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

### ⭐⭐⭐⭐⭐ Perfect replacement
*by D***N on 2 January 2026*

Perfect replacement for my existing one.

## Frequently Bought Together

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-25*