If your Glacier Bay dual-flush toilet has the numbers 215-583 or N2316, you are looking at two different identifiers for the same toilet family—not necessarily two different toilets.
This is a good example of why replacement toilet parts can be confusing: a retailer item number, manufacturer model number, and replacement-part listing can all use different wording.
What do 215-583 and N2316 mean?
Original Glacier Bay documentation for this toilet identifies it as Item #215-583 and Model #N2316. It is a two-piece, high-efficiency elongated dual-flush toilet. Niagara's support materials also list N2316 under its Glacier Bay dual-flush toilet support section.
So if one document says “215-583” and another says “N2316,” that does not automatically mean you have two different models.
Why you may see Niagara and Glacier Bay together
Niagara provides technical support and replacement-part documentation for several Glacier Bay toilet models, including N2316. That is why searches for this toilet frequently contain both the Niagara and Glacier Bay names.
When searching for a replacement lid, try every verified identifier you find rather than searching only the brand printed on the toilet.
Where to find the model information
Carefully remove the tank lid and look inside the tank for printed, stamped, or molded information. On this toilet family, useful search terms can include:
- Glacier Bay
- N2316
- 215-583 or 215583
- N2316TL when used by replacement-lid sellers
Our replacement listing is here: Niagara / Glacier Bay N2316TL replacement tank lid.
This is a dual-flush toilet
The N2316 family uses a top-mounted dual-flush button. That matters when buying a tank cover because the lid must have the correct opening and shape for the flush-button assembly.
Do not substitute a similar-looking solid lid from a single-flush toilet just because the outside dimensions appear close.
Does a replacement lid include the flush button?
Not necessarily. A ceramic tank lid and a dual-flush button are separate parts. Always read the individual product listing to see exactly what is included.
The FixALid N2316TL listing is for the ceramic lid itself; the flush button is not included unless a listing specifically says otherwise.
How to confirm the replacement before ordering
Use the model number as your primary clue, then verify the physical lid.
- Confirm the tank markings. Look for N2316 and any Glacier Bay identifiers.
- Measure the tank opening. Record the maximum width and front-to-back depth.
- Measure the original lid. If you still have it, measure the widest points.
- Check the button opening. Make sure the replacement is designed for the same top-mounted dual-flush configuration.
- Compare the underside. The inner lip and ceramic locating features should match.
- Confirm color last. Fit comes before finish.
Common search variations
Customers may search this toilet several ways:
- Glacier Bay 215-583 lid
- Glacier Bay 215583 tank lid
- N2316 toilet tank lid
- Niagara N2316 lid
- N2316TL tank cover
A good replacement catalog should connect legitimate alternate searches back to one physical product instead of forcing the customer to already know the seller's preferred part number.
One toilet, several identifiers
The important point is simple: 215-583 and N2316 are documented identifiers associated with the same Glacier Bay toilet family. When replacing the tank lid, use those numbers together with measurements, flush-button configuration, and underside photos to confirm the match.
That approach is much safer than choosing a lid based only on a similar white rectangular shape.