Thermos 1.2L King & Work Flask Replacement Seals (2-Pack)

2-Pack Replacement Sealing Ring Gaskets for Thermos® King & Work Series Flasks (1.2L / 40oz)

Restore your favourite travel flask to leak-proof perfection! Designed by Perform Research, these high-quality replacement silicone sealing rings offer a tight, reliable seal for your daily brew or cold drinks—preventing messy spills and preserving temperature.

Unlike standard original gaskets, these upgraded black seals resist dark coffee and tea stains, staying cleaner and looking fresh for longer.

Key Features & Benefits

• Stain-Resistant Upgrade: Upgraded black silicone prevents discolouration from tea and coffee, making maintenance effortless.
• Leak-Proof Performance: Thoroughly tested replacement seal designed to restore a tight, secure fit to your stopper.
• Great Value 2-Pack: Includes 2 seals (1 required per flask), giving you a handy spare for the future.
• Durable & Easy to Clean: Made from high-grade, food-safe silicone that is flexible, long-lasting, and easy to wash.
• Compatibility

Designed specifically to fit the following models:

• Thermos® King Flask – 1.2L (40oz)
• Thermos® Work Series Flask – 1.2L (40oz)
• Note: The stopper and flask are not included. This listing is for the sealing gaskets only.

Product Specifications

Disclaimer: This product is an aftermarket replacement part manufactured and tested by Perform Research. It is not an original OEM part manufactured by Thermos®. Original parts and stoppers are available directly from Thermos®.