Fluidmaster 5403 Toilet Flapper and 242 Seal Kit
- 3 inch flush valves, adjustable flapper
- 1.28 to 1.6 gallons per flush toilets
- Silicone seal claimed to last 10X longer
- Dial adjusts for water saving
- 242 seal fits the 400A fill valve
Updated 20 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A smart two-part fix for a running toilet with a matching flush valve and a Fluidmaster fill valve. It fits only the flush valve size it lists.
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ASIN: B0CYLZJTJQModel: 5403Category: Toilet Flappers
Overview
Swapping out a leaky flapper and a worn fill valve seal together fixes the two most common causes of a running toilet. The Fluidmaster flapper uses a silicone seal and an adjustable dial, and the seal restores the matching fill valve.
Fixing both leak points in one visit avoids a second trip to the store. The flapper fits only the listed flush valve size, and the seal only fits Fluidmaster's universal fill valve.
Who it's for
DIYers dealing with ghost flushing or a constantly running tank who want both seals refreshed. Owners of older toilets with smaller flush valves need a different flapper.
Pros and cons
- Fixes flapper and fill valve leaks
- Silicone resists chlorine and hard water
- Dial tunes flush volume
- No tools needed for the seal
- 3 inch flush valves only
- Seal fits one fill valve model
- Flapper color differs across listing
Performance notes
A flapper seals by its weight on the flush valve seat, so the silicone face resists warping from chlorine. The dial changes how long the flapper stays open, which sets water use per flush.
Specifications
| Brand | Fluidmaster |
|---|---|
| Model | 5403 |
| Dimensions & fit | |
| Flush valve size | 3 inches |
| Capacity & performance | |
| Compatible flush volume | 1.28 to 1.6 gallons per flush |
| Construction & materials | |
| Material Type | Silicone |
| Compatibility & installation | |
| Seal compatibility | Fluidmaster 400A fill valve |
| Other details | |
| Inlet Connection Type | Flange |
| Adjustment | Dial for flush efficiency |
| Product 2 | Extend the lifespan of your 400A toilet fill valve |
Frequently asked questions
Will the Fluidmaster 5403 flapper fit my toilet?
It fits most toilets with a 3 inch flush valve, including high efficiency 1.28 to 1.6 gallons per flush models.
What does the Fluidmaster 242 seal fit?
It is a direct replacement seal for the universal 400A fill valve.
How does the Fluidmaster 5403 save water?
Its dial adjusts the flapper for flush efficiency and lower water use.
Will the 242 seal fix a broken fill valve?
It fixes a broken fill valve seal without buying a new 400A fill valve.