American Standard Toilet Flapper: Which One Fits?

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Quick answer from a licensed plumber: Find the four-digit tank number inside the tank first. American Standard lists the 7381193-200.0070A 3-inch flapper for Cadet toilets, the 7381424-100.0070A silicone flapper for VorMax, and for the Champion, whose flapper assembly twists onto a guide rod, the 7301111-0070AP seal kit (green-top two-piece and one-piece valves) or, on a two-piece, a 7382098 flapper assembly matched to 1.28 or 1.6 gpf (maroon-top valve, and American Standard’s newer pick for the green-top one).

Cadet with a 3-inch flapper? American Standard lists the 7381193-200.0070A. See the American Standard 7381193-200.0070A on Amazon

American Standard Flappers and Seals at a Glance

American Standard does not use one flapper across its toilets. Its own support articles point to a different part for each flush valve family:

Every row comes from American Standard’s knowledge base, linked in the sources below. American Standard also notes that it has updated its Champion flush valves over the years, so the right seal depends on which valve version is in your tank. The 7382098 assemblies come from its article on two-piece Champions with the green-top 7381983-400.0070A valve, which it says has been replaced by the maroon-top valve; its maroon-flapper replacement steps apply only to the 7382106-100.0070A valve.

Step 1: Find the Four-Digit Tank Number

Lift the lid and look at the back wall of the tank near the water line. American Standard says you will find a four-digit number “stamped into the china or as a stamp with a barcode.” That is the tank model number: if it starts with a 2, it is a one-piece toilet; if it starts with a 4, it is a two-piece. Write it down before you shop. It is the number American Standard’s parts guide is organized by, and some part listings print a list of the tank numbers they fit.

Step 2: Look at the Flush Valve

• A hinged rubber flapper on a round drain opening, chain to the handle. That is a flapper toilet. On a Cadet, American Standard lists the 3-inch flapper. If your tank number is 4112, it lists the 2-inch 7381129-200.0070A because the original is no longer available.
• A flapper assembly that sits on a guide rod and twists off it. That is a Champion flush valve. Its seal is held to the flapper body by a locking ring, or the whole assembly is replaced, depending on the version. Note the color of the top: American Standard separates the older green-top valve (linked chain, clear/frosted or red seal) from the newer maroon-top valve.
• A beaded chain and a black thumbscrew on a Champion valve. American Standard treats this as a third style with its own seal instructions, separate from the green-top kit.

Step 3: Confirm It Is the Flapper Before You Buy

American Standard’s troubleshooting starts with the chain and a leak test, not with a new part. For the leak test, close the shutoff valve under the tank, mark the water line and check back after an hour or more (overnight is best) to see where the level stopped:

• Chain first. On the Champion, American Standard says the chain is set correctly “if the flush valve opens instantly when you push the handle and closes securely the moment you let go,” taut with no slack but long enough to let the valve seal.
• Water drops to the flapper and stops: replace the flapper or seal.
• Water drops below the flapper, to where the flush valve meets the tank: the flush valve itself needs replacing. For flush valve kits, see our flush valve replacement guide.
• Water never drops, but the tank keeps running into the overflow tube: the fill valve. American Standard says this is typically debris stuck inside the fill valve, and suggests flushing it out before you replace it with the Universal Fill Valve, 7381125-400.0070A. Our American Standard fill valve guide covers the leak test and the part.

I send an occasional note when a new guide goes up — repairs worth doing yourself, and the parts that actually last. No spam, no course funnel; written by a licensed Georgia plumber.

Changing a Champion Seal or Flapper Assembly

American Standard’s steps for the green-top valve (7301111-0070AP seal): lift the flapper assembly, hold the guide rod, turn the flapper counterclockwise to remove it, turn the lower locking ring counterclockwise to release the old seal, fit the new seal and twist the lock clockwise until it is locked, then turn the assembly clockwise back onto the rod.

For the maroon-top valve, you replace the whole flapper assembly: turn it counterclockwise off the rod, then turn the new one clockwise until it stops, and “keep turning until you feel/hear two clicks.” Order the assembly that matches your toilet’s gallons per flush.

What to Buy

Genuine American Standard parts first, matched to the table above:

• Cadet, 3-inch: American Standard 7381193-200.0070A 3-inch flapper set (2-pack), sold by Amazon. The listing prints a long list of tank numbers it is for; check yours against it.
• Cadet tank 4112 or another 2-inch valve: American Standard 7381129-200.0070A 2-inch flapper with float, sold by Amazon.
• VorMax: American Standard 7381424-100.0070A VorMax silicone seal (2) (not linked: third-party seller only on 10/3/2026).
• Champion 4 seal, aftermarket option: Korky 450BP flush valve seal for Champion 4, sold by Amazon. Its Amazon listing says it is designed to replace American Standard part 7301111-0070A. It is not an American Standard part; when we searched Amazon we did not find a genuine American Standard 7301111-0070AP seal kit or 7382098 flapper assembly.
• Cadet 3, aftermarket option: Fluidmaster 5401GB 3-inch flapper (not linked: third-party seller only on 10/3/2026). Fluidmaster says the 5401GB “also works on American Standard® Cadet 3.” It is built for Glacier Bay 3-inch toilets; see our Glacier Bay flapper guide.

Parts You’ll Also Need

Usually the flapper is the whole repair. The one other part American Standard points to for all three families is its universal fill valve:

• A fill valve, only if the leak test points to it: American Standard Universal 400A fill valve (7381125-400.0070A), sold by Amazon. American Standard lists this same part for Champion, Cadet and VorMax toilets.

When to Call a Licensed Plumber

• The leak test says the flush valve is bad and the tank has to come off the bowl.
• The tank or the tank-to-bowl bolts are leaking onto the floor.
• The shutoff valve under the tank will not close, so you cannot drain the tank.

FAQ

What flapper does an American Standard Cadet toilet use?

American Standard lists the 3-inch Toilet Tank Flapper Valve Set, part 7381193-200.0070A, for Cadet toilets except the pressure-assisted version. For a Cadet with tank number 4112, it lists the 2-inch 7381129-200.0070A because the original flapper is no longer available.

Does an American Standard Champion toilet have a flapper?

Not the kind that hooks onto two pegs. The Champion flush valve uses a flapper assembly that twists onto a guide rod, with a replaceable seal. The two-piece green-top valve takes the 7301111-0070AP Champion Seal Kit, or the complete flapper assembly American Standard now lists for it; the maroon-top valve takes the flapper assembly. The assembly is 7382098-128.0070A for 1.28 gpf or 7382098-160.0070A for 1.6 gpf.

Where is the model number on an American Standard toilet?

On the back wall inside the tank, near the water level mark. American Standard says it is a four-digit number stamped into the china or printed with a barcode. A number starting with 2 is a one-piece toilet; one starting with 4 is a two-piece.

What setting should the Cadet flapper be on?

American Standard says notch 3 on the numbered bulb under the 7381193-200.0070A flapper is the standard 1.28 gallons per flush and notch 10 is 1.6 gpf. It also says a higher setting helps if the toilet flushes poorly.

How do I know if I need a flapper or a whole flush valve?

Do American Standard’s leak test. If the tank water drops to the top of the flapper, replace the flapper or seal. If it drops below that, to where the flush valve meets the tank, the flush valve needs replacing.

Why Trust Plumbing Picks

Plumbing Picks is written by a licensed Georgia journeyman plumber. Every part number, size and fit on this page comes from the manufacturer pages and documents listed below, which we opened and read; product details come from those makers and from the Amazon listings, not from hands-on testing. Each linked product was shipped or sold by Amazon, new and in stock, when we checked on September 24, 2026. Nobody pays to be included here. Where a link goes to Amazon we may earn a commission at no extra cost to you. More on who writes this and how we pick.

Sources

• American Standard: How do I fix a running American Standard Champion Toilet?
• American Standard: How do I fix a running American Standard Cadet and VorMax Toilet?
• American Standard: What’s the correct setting for the Cadet flapper, part 7381193-200.0070A?
• American Standard: Which flapper can be used for a Cadet Toilet, Tank model number 4112?
• American Standard: Where can I find the model number of my toilet?
• American Standard: How do I replace the flush valve seal for the Champion toilet?
• American Standard: Champion one-piece toilet with the 3280.040-0070A flush valve
• American Standard: Champion two-piece toilet with the 7381983-400.0070A flush valve
• American Standard: How do I replace the maroon flapper assembly on my Champion flush valve?
• Fluidmaster: 5401GB Adjustable 3″ Flapper

Bottom Line

Read the tank number, look at the valve, and match it to American Standard’s own part: 7381193-200.0070A for a Cadet, 7381424-100.0070A for a VorMax, and the 7301111-0070AP seal or a 7382098 assembly for a Champion. Do the leak test first so you replace the part that is actually leaking.