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Quick answer from a licensed plumber: The replacement parts we found made for Glacier Bay toilets come from Fluidmaster and Korky. For a single flush toilet, measure the flapper: Fluidmaster’s 5401GB is made for Glacier Bay 3-inch flush valves (and fits the American Standard Cadet 3) and its 5052GB for 2-inch. For a dual flush toilet, there is no flapper, just a seal, and the valve color decides it: Korky’s 441 for a white valve, 444 for a black one.
Glacier Bay with a 3-inch flapper? Fluidmaster makes the 5401GB for it. Not linked: on 10/3/2026 the Amazon listing was sold by a third-party seller, not by Amazon or the maker.
Glacier Bay Flappers and Seals at a Glance
The replacement parts we found made specifically for Glacier Bay toilets come from two big toilet-part makers, Fluidmaster and Korky. Here is what they say fits:
| What is in your tank | Part the maker says fits | Maker |
|---|---|---|
| 3″ flapper (Glacier Bay 3″ flush valve) | 5401GB adjustable 3″ flapper; also fits American Standard Cadet 3 | Fluidmaster |
| 2″ flapper (Glacier Bay 2″ flush valve) | 5052GB 2″ flapper | Fluidmaster |
| Wider 3″ flapper systems | 5403 universal 3″ with an extra hinge adjustment | Fluidmaster |
| Dual flush, white flush valve | 441 Dual Flush Seal A | Korky |
| Dual flush, black flush valve | 444 Dual Flush Seal D | Korky |
| Dual flush, not sure which | 440 kit with both Seal A and Seal D | Korky |
Step 1: Single Flush or Dual Flush?
A handle on the side of the tank and a hinged flapper at the bottom means single flush: go to Step 2. Two buttons on the lid and a round canister in the middle of the tank means dual flush: there is no flapper, only a seal at the bottom of the canister, and the color of the flush valve decides which one (Step 3).
Step 2: 2-Inch or 3-Inch Flapper
Measure the drain opening the flapper sits on, or compare the old flapper with a ruler. Our 2-inch vs 3-inch flapper guide shows how. Then:
- 3-inch: Fluidmaster says its 5401GB is “specifically designed to fit and enhance performance on Glacier Bay® 3″ Flush Valve Toilets, but this model also works on American Standard® Cadet 3.” Its FAQ explains why: the 5401 is “a direct replacement for both the Glacier Bay and American Standard models that are equipped with a 540 Flapper and flush system.”
- 3-inch but the 5401 does not fit: Fluidmaster says its 5403 comes with an additional adjustment for the hinge that lets it attach to wider 3-inch systems that are not Glacier Bay or American Standard.
- 2-inch: Fluidmaster’s 5052GB is “designed to be a direct replacement part for your Glacier Bay® 2″ flush valve toilet,” with a float you move down for more water and up for less.
Step 3: Dual Flush Glacier Bay: White or Black Valve
Korky says the seal depends on the color of the flush valve, not just the tank:
- White flush valve: the 441 Seal A. Its listing names Glacier Bay tank models N2316, N2430E, N2428R-DF and TL-6900-EW with flush valve model A2422, and says it does not fit black Glacier Bay valves.
- Black flush valve: the 444 Seal D. Its listing names Glacier Bay tanks N2316, N2420, N2430E and N2428-DF with flush valve model 830VBGB, and says it fits black Glacier Bay valves only.
- Not sure: Korky’s 440 kit includes both seals.
Notice that some tank numbers (N2316, N2430E) appear on both lists. That suggests the same tank model has been built with different flush valves, which is why the valve color, not the tank number, is the thing to check.
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Before You Buy: Is It the Flapper at All?
Korky’s advice for a Glacier Bay that keeps running: “Start by checking your flush valve seal or toilet flapper. If either of these parts is leaking, the fill valve will turn on to replace the lost water in the tank. If replacing the flapper or seal doesn’t fix it, replace your fill valve next.” For the full sequence, see our guide to a toilet still running after a new flapper.
What to Buy
Matched to the table above:
- 3-inch Glacier Bay: Fluidmaster 5401GB 3-inch flapper for Glacier Bay (not linked: third-party seller only on 10/3/2026). The listing says it is a direct replacement for Glacier Bay 3-inch flush valve toilets and also fits the American Standard Cadet 3.
- 3-inch, wider hinge: Fluidmaster 5403 universal 3-inch flapper, sold by Amazon.
- Dual flush, white valve: Korky 441 Dual Flush Seal A, sold by Amazon.
- Dual flush, black valve: Korky 444 Dual Flush Seal D, sold by Amazon.
- 2-inch Glacier Bay: we did not link the Fluidmaster 5052GB. The only listing we found was shipped and sold by a third-party seller. The Korky 440 two-seal kit was down to a low-stock warning, so we linked the two seals separately.
Parts You’ll Also Need
Korky’s next step if the flapper was not the problem:
- A fill valve, only if a new flapper or seal does not stop the running: Korky 528MP QuietFILL Platinum fill valve, sold by Amazon. Korky lists the 528, 528MP and 528X for Glacier Bay; the 528MP adds a refill adjuster, and its listing gives a height range of 7.75 to 13.5 inches.
When to Call a Licensed Plumber
- The tank leaks at the bolts or at the tank-to-bowl gasket.
- A dual flush canister’s base is cracked, which means replacing the flush valve with the tank off.
- The shutoff valve will not close.
FAQ
What flapper fits a Glacier Bay toilet?
For a 3-inch Glacier Bay flush valve, Fluidmaster makes the 5401GB; for a 2-inch valve, the 5052GB. Fluidmaster also says its universal 5403 fits most 3-inch systems and has an extra hinge adjustment for wider ones.
Does the Glacier Bay flapper fit an American Standard Cadet 3?
Yes, per Fluidmaster. It says the 5401GB also works on the American Standard Cadet 3, and calls the 5401 a direct replacement for Glacier Bay and American Standard models equipped with a 540 flapper and flush system.
Which dual flush seal does my Glacier Bay need?
Look at the flush valve color. Korky says its 441 Seal A fits white Glacier Bay flush valves only and its 444 Seal D fits black ones only. Its 440 kit includes both if you are not sure.
Why is my Glacier Bay toilet still running?
Korky says to check the flapper or flush valve seal first, because a leak there makes the fill valve keep turning on. If a new flapper or seal does not fix it, replace the fill valve next.
Can I use bleach tablets in a Glacier Bay tank?
Fluidmaster says not to. Its Glacier Bay flapper pages warn that in-tank cleaners with bleach or chlorine damage tank components and may cause flooding.
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
- Fluidmaster: 5401GB Adjustable 3″ Flapper
- Fluidmaster: 5052GB 2 in. Toilet Tank Flapper for Glacier Bay
- Fluidmaster: 5403 Universal Adjustable 3″ Flapper
- Korky: Glacier Bay Toilet Replacement Parts
Bottom Line
Single flush: measure 2 or 3 inches and use Fluidmaster’s Glacier Bay flapper for that size. Dual flush: check whether the flush valve is white or black and buy Korky’s matching seal. If the toilet still runs after that, the fill valve is next.