How to Replace a Gasket on Your Travel Tumbler
By Reusable Water Bottles, Flasks and Travel Cups | 24Bottles® | Published: 2026-10-21
Category: How-to Guides
Learn how to diagnose a leaky travel tumbler and replace its silicone gasket step by step. A quick fix that restores a perfect seal and extends your cup's life.
Quick answer
If your travel tumbler leaks, the silicone gasket is likely worn or misaligned. Replacing it with a fresh one restores a leakproof seal in minutes.
When to replace vs. when to just reseat
A gasket that looks flat, cracked, or permanently squished needs replacement. A gasket that is simply out of place can often be reseated without buying a new one. Check for visible damage first.
If the leak happens only when the lid is fully tightened, the gasket may be pinched. Try loosening slightly. If that fixes it, the gasket is still usable but may need replacing soon.
Why silicone gaskets wear out
Silicone is durable, but over time heat, frequent washing, and repeated compression can cause it to lose elasticity. A gasket that no longer springs back to shape cannot form a consistent seal.
Using the tumbler for hot beverages accelerates wear. If you drink coffee or tea daily, expect to replace the gasket every few months rather than yearly.
Diagnose and fix your leaky tumbler
- Symptom: Water seeps from the rim when the tumbler is tipped or shaken. The lid feels tight, but the seal is not holding.
- Likely cause: The silicone gasket is compressed, cracked, or no longer flexible. It cannot maintain contact with the lid and rim. Remove the lid and inspect the gasket. If it looks flattened or has a visible crack, it needs replacement.
- Corrective action: Peel off the old gasket from the lid groove. Clean the groove with warm soapy water and dry it. Press the new silicone gasket evenly into the groove, making sure it sits flush all around. Reattach the lid and test with water. If the leak stops, you are done. If it continues, the gasket may still be misaligned — remove and reseat it carefully.
- Stop or choose another option: If the leak persists after a second reseat, the lid itself may be warped or the tumbler rim may be damaged. In that case, contact the manufacturer or consider a replacement cup. A damaged lid or rim cannot be fixed with a new gasket alone.
What you need
- Accessories | Travel Tumbler Gaskets: Each pack contains 2 silicone gaskets to extend the life of your favorite 24Bottles. Having a spare on hand means you can fix a leak immediately without waiting for a new pack.
Accessories | Travel Tumbler Gaskets
