Fluidmaster 5403 Universal Toilet Flapper 3 Inch
- 3 inch universal flush valve size
- Silicone seal lasts up to 10X longer
- Adjustable dial to save water
- Kink-free chain, resists chlorine and hard water
- Lifetime warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A universal replacement flapper with a water-saving dial. It does not suit smaller valves, so measure the flush valve first.
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ASIN: B002C1AVV8Model: 5403Category: Toilet Flappers
Overview
Fluidmaster's universal flapper fits a three inch flush valve and has a silicone seal said to last far longer than a plain rubber one. The dial adjusts how long it stays open, and a kink-free chain connects it to the handle.
A longer-lasting seal and a water-saving dial are the headline features. The listing says it resists chlorine and hard water, which wear out ordinary flappers. Smaller valves are out of scope.
Who it's for
A homeowner replacing a tired flapper gets an adjustable, long-life part. Owners of toilets with a smaller valve need a different size.
Pros and cons
- Silicone seal for longer life
- Adjustable dial saves water
- Resists chlorine and hard water
- Three inch valve only
- Rubber body listed
- Adjustment needs a trial flush
- Chain length not listed
Performance notes
The dial changes how long the flapper stays open, which sets water use per flush. A silicone seal resists the chlorine and minerals that harden rubber. Valve size must match for a leak-free fit.
Where it stands among toilet flappers
- #3 most-searched brand and model of the 11 toilet flappers lines we track (by search demand, not sales).
From the specs of the 31 toilet flappers we list; not a test result.
Specifications
| Brand | Fluidmaster |
|---|---|
| Model | 5403 |
| Dimensions & fit | |
| Flush valve size | 3 inches |
| Item dimensions | 5.25 x 9 x 3.25 inches |
| Construction & materials | |
| Material Type | Rubber, silicone seal |
| Color | Red |
| Included components | |
| Included Components | Fluidmaster 5403 3-Inch Universal Water Saving Long Life Toilet Flapper |
| Number Of Packs | 1 |
| Warranty & support | |
| Manufacturer Warranty Description | Lifetime |
| Other details | |
| Valve Type | Standard, universal |
| Inlet Connection Type | 3 inch flush valve |
| Special Features | Adjustable dial, kink-free chain, resists chlorine and hard water |
| Connector Type | Socket |
| Outlet Connection Type | 3-inch flush valve |
| Set Name | Toilet Valve Set |
Frequently asked questions
How do I look after the Fluidmaster flapper?
The listing gives no cleaning steps. It says the part resists chlorine and hard water.
Does the Fluidmaster 5403 fit a two inch flush valve?
No. It is sold as a 3 inch universal flapper for a 3 inch flush valve.
What does the dial on the Fluidmaster 5403 do?
The listing says the adjustable dial saves water.