Fluidmaster 400CAR3P5 PerforMAX Fill Valve and Flapper Kit
- Three inch flush valve toilets only, with adjustable flapper
- Adjustable fill valve height, flapper arms fit most toilet models
- 1.28 and 1.6 gallons per flush toilets, including HET
- Silicone flapper seal, anti-siphon design, code approved
- Compatible with American Standard, Eljer, Glacier Bay, Kohler, Toto
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A repair kit that replaces a worn fill valve and flapper on a toilet with a three inch flush valve. It does not suit toilets with other flush valve sizes, so measure the opening first.
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ASIN: B013KRPJIWModel: 400CAR3P5Category: Toilet Flappers
Overview
Fluidmaster sells this PerforMAX kit as a way to fix a noisy or running toilet by replacing the fill valve and the flapper together. The valve height adjusts to the tank, and the flapper arms fit most models with a three inch drain.
One box covers both parts that most often cause constant refilling or a running tank, and the adjustable height reduces fitting guesswork. The limit is size: it is for three inch flush valves only, and the listing gives no tank or shank dimensions.
Who it's for
Homeowners and landlords who want to replace both worn parts in one visit will find the kit convenient. Anyone unsure of the flush valve size, or with an older model outside the listed brands, should measure the opening before buying.
Pros and cons
- Replaces fill valve and flapper together
- Adjustable valve height for tank fit
- Silicone seal on the flapper
- Anti-siphon design, code approved
- Three inch flush valve only
- Tank and shank dimensions not listed
- Included hardware list not given
Performance notes
The flapper seals the flush valve opening, and a worn or stiff seal lets water leak into the bowl so the fill valve restarts. A silicone seal resists the stiffening that causes that leak. The adjustable fill valve is set to the water level the tank needs, and the anti-siphon design prevents backflow into the supply line.
Specifications
| Brand | Fluidmaster |
|---|---|
| Model | 400CAR3P5 |
| Dimensions & fit | |
| Flush valve size | 3 inches |
| Capacity & performance | |
| Suited flush volume | 1.28 and 1.6 gallons per flush |
| Construction & materials | |
| Seal material | Silicone |
| Compatibility & installation | |
| Compatible brands | American Standard, Eljer, Glacier Bay, Kohler, Toto and others |
| Other details | |
| Valve Type | Adjustable fill valve with adjustable flapper |
| Code status | Anti-siphon design, code approved |
Frequently asked questions
How do I look after the Fluidmaster 400CAR3P5?
The listing gives no care steps. A silicone seal and adjustable settings mean you can reset the valve height if the tank fill level drifts.
Will this kit fit my toilet?
It fits toilets with a three inch flush valve and, per the listing, brands like American Standard, Eljer, Glacier Bay, Kohler and Toto. Measure your flush valve first.
What toilets is the PerforMAX kit suited to?
The listing says best use is in toilets rated at 1.28 gallons per flush (HET) and 1.6 gallons per flush.
Does it include a flapper?
Yes. The listing says a three inch water saving adjustable flapper is included with the fill valve.