Stopper Covers and Stoppers for Zojirushi Mugs: Which Fits?

By Zojirushi Online Store | Published: 2026-10-16

Category: Buying Guides

Match the right stopper cover or stopper set to your Zojirushi mug using the model number on the base. Includes color options and what to check before ordering.

Quick answer

The only reliable way to choose a Zojirushi stopper cover or stopper set is to match the model number printed on the base of your mug. A stopper cover is the outer cap piece; a stopper set includes the full stopper assembly. If you see "EXCLUDES STOPPER SET" in a listing, that part is the cover only. Buy the exact part number for your model, and treat color as a separate choice once fit is confirmed.

Cover vs. set: what you are actually replacing

Zojirushi mug lids use a two-part system: the stopper set (the inner assembly with the gasket and valve) and the stopper cover (the outer piece that presses over it). If your mug leaks from the lid, the gasket inside the stopper set is the usual culprit. If the cover is cracked, discolored, or will not snap down, you need the cover. Some listings sell the cover alone and clearly state "EXCLUDES STOPPER SET" — those will not fix a leaking gasket. Other listings sell the full stopper set. Decide which part failed before you shop, because the two are not interchangeable.

How to read the model number on your mug

Turn the mug upside down. The model number is printed on the base, usually in a format like SM-SG48, SM-YAE48, SM-TAE48, or SM-TA36/48/60. Write down every character, including letters after the base number such as AZ, GA, or SAAZ. Those suffixes matter: a stopper cover made for SM-SG48 (-AZ) is not the same part as one made for SM-TAE48SAAZ. If the base label is worn, check the original packaging, your order history, or the manual. Do not guess from the mug's color or capacity alone.

Color options and why they are listed separately

Zojirushi lists stopper covers by both model and color because the same mug body can ship in different finishes. For example, the Stopper Cover (Blue) for SM-SG48 (-AZ) is listed as Sketch Blue, and the Stopper Cover (Black) for SM-TA36/48/60BA/XA / 48KTBA / TAE48SABJ/BZ is a separate part. Color is cosmetic; fit is not. If your exact color is unavailable, a different color of the same part number will still function, but it will not match your mug. Check the listing title carefully — the color word is part of the product name, not a filter you can ignore.

What to check before you order

Confirm three things: the model number on your mug, whether you need a cover or a full stopper set, and whether the listing says "EXCLUDES STOPPER SET." Also check for any interchangeability notes in the catalog facts. For instance, the Stopper Cover Set (Blue) for SM-TAE48SAAZ is listed as interchangeable with Lid Set BB685K01L-04, which means it can serve as a lid replacement in that specific case. Do not assume interchangeability beyond what the listing states. If a specification such as gasket material or exact dimensions is not shown, treat that as a limitation and contact support rather than guessing.

Decision rules for choosing your stopper part

Rule 1: Match the full model number, not just the series: Write down every character on the base label, including suffixes like -AZ, GA, or SAAZ. A cover for SM-SG48 (-AZ) is not the same as one for SM-TAE48SAAZ. If the suffix does not match, do not order.
Rule 2: Leaks mean stopper set, cracks mean cover: A leaking lid usually points to the inner gasket in the stopper set. A cracked or loose outer cap points to the stopper cover. Listings marked EXCLUDES STOPPER SET are cover-only. Buy the part that matches the failure, not the part that is cheaper.
Rule 3: Treat color as a separate decision: Color is cosmetic. If your exact color is out of stock, a different color of the same part number will still fit and function, but it will not match your mug. Confirm fit first, then choose color.
Rule 4: Check interchangeability notes before assuming: Only rely on interchangeability that is explicitly stated, such as the Stopper Cover Set (Blue) for SM-TAE48SAAZ being interchangeable with Lid Set BB685K01L-04. If interchangeability is not listed, assume it does not apply.

Grounded product facts

Stopper Cover (Blue) for SM-SG48 (-AZ) Sketch Blue **EXCLUDES STOPPER SET: Stopper Cover (Blue) for SM-SG48 (-AZ) Sketch Blue, labeled EXCLUDES STOPPER SET. This is the outer cover only. If your mug leaks, you likely need the stopper set instead.
Stopper Cover Set (Green) for SM-YAE48GA: Stopper Cover Set (Green) for SM-YAE48GA. A full set for the SM-YAE48GA model, so it addresses both the cover and the inner stopper assembly.
Stopper Cover Set (Blue) for SM-TAE48SAAZ: Stopper Cover Set (Blue) for SM-TAE48SAAZ, interchangeable with Lid Set BB685K01L-04. If you need a lid replacement for this model, this set can serve that role per the catalog note.
Stopper Cover (Black) for SM-TA36/48/60BA/XA / 48KTBA / TAE48SABJ/BZ **EXCLUDES STOPPER SET: Stopper Cover (Black) for SM-TA36/48/60BA/XA / 48KTBA / TAE48SABJ/BZ, labeled EXCLUDES STOPPER SET. Fits several SM-TA sizes, but it is still cover-only, so confirm whether your issue is the cover or the gasket.

Who this guide is for

Best for

Owners who have the model number from the base of their Zojirushi mug and need a specific stopper cover or stopper set.
Buyers replacing a cracked outer cover or a worn stopper set on a known model like SM-SG48, SM-YAE48GA, SM-TAE48SAAZ, or SM-TA series.
Shoppers who want to confirm whether a listing is cover-only or a full set before ordering.

Not for

Owners who cannot find or read the model number on their mug — contact support first.
Buyers looking for a universal stopper that fits any Zojirushi mug; these parts are model-specific.
Anyone trying to fix a leak without checking whether the gasket in the stopper set is the actual failed part.