Zojirushi Lid Cover Gasket

This gasket is specifically designed for the SM-KA, SM-KB, SM-KC, and SM-KHE series. You can verify your specific model number by checking the bottom of your mug or the original packaging.

Not at all. The process is straightforward: simply remove the old, worn-out gasket using a small tool or your fingernail, clean the area, and press the new gasket firmly into the groove until it sits flush.

Leaking is almost always caused by a degraded or misaligned gasket. Over time, these silicone seals lose their elasticity or accumulate residue, preventing a tight closure; replacing the gasket usually restores the leak-proof seal immediately.

Yes, if you notice your beverage temperature dropping faster than usual or if the lid feels loose, the gasket has likely lost its structural integrity. Silicone can harden or shrink over time, which isn't always visible to the naked eye.

While the gasket itself is durable, we recommend hand-washing it with mild dish soap and warm water. High-heat dishwasher cycles can accelerate the degradation of the silicone material, shortening its lifespan.