- Compatible with Stanley Thermo S Classic models and Stanley Classic Vacuum Insulated Wide Mouth Bottle (1.5QT), this replacement stopper is ideal for various beverages including water, yerba mate, coffee, and tea. - Designed specifically for the Stanley Classic 1.5QT, the stopper measures approximately 2.18 x 2.52 x 1.86 inches. Please verify compatibility with your Thermo S flask before purchasing to avoid any issues. - Made from food-grade, BPA-free material, this stopper meets high quality standards. Each stopper has undergone rigorous testing to ensure durability and safety, with no unpleasant odors, allowing you to drink with confidence. - The stopper features silicone rings and five mating threads for a strong, leak-free seal, helping to maintain your beverage's temperature for longer periods. - Installation is straightforward: simply remove the old stopper and replace it with our new one. In just minutes, your Thermo S will feel as good as new. The design allows for easy disassembly and cleaning. Use Cases: 1. Perfect for outdoor adventures, keeping your coffee hot during camping trips or hikes. 2. Great for everyday use, ensuring your water stays cold throughout the workday. 3. Ideal for tea enthusiasts, providing a reliable seal to prevent spills during travel.