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Diamond Steel Button Flip Lid Cap for Thermosteel Vacuum Flask | Compatible with Milton Bottle The Diamond Steel Button Flip Lid Cap is a high-quality replacement lid designed specifically for Thermosteel vacuum flasks. This flip-top lid is perfect for maintaining the temperature of your beverages, whether hot or cold, while providing easy access for sipping or pouring. The lid is equipped with a secure button flip mechanism that ensures a tight seal, preventing leaks and spills, making it ideal for use on the go. Crafted from durable, food-grade materials, this lid is both safe and long-lasting, ensuring your Thermosteel flask remains functional for years to come. It’s easy to clean and simple to attach, offering a perfect fit for Milton flasks and other compatible bottles.