Compatibility: Adapter designed for Stanley 30 oz Quencher bottles, enabling use of Cir-kul flavor cartridges. The package ONLY contains the ADAPTER. Other products (such as lids, caps, and cups) are NOT included. Easy Installation: Unscrew your lids of the 30 oz quencher tumbler and water bottle, then screw this lid converter onto your 30 oz quencher tumbler, then attach your water bottle cap to this adapter. Easy to Use: The finger groove design makes twisting the cap effortless. To prevent leaks, ensure that you twist tightly when installing. Reusable, Durable, Safe Materials: Food-grade BPA-free plastic and silicone, dishwasher safe, and easy to clean. Screw Tightly for Leakproof: Secure silicone gasket prevents spills. This innovative adapter allows you to use your Cir-kul flavor cartridges with your 30 oz Stanley Quencher water bottle, providing a convenient and eco-friendly way to enjoy flavored water on-the-go. Made from BPA-free plastic and food-grade silicone, it's designed to be leak-proof and safe for your beverages. Simply screw the adapter onto your Stanley bottle, insert your Cir-kul cartridge, and enjoy a refreshing burst of flavor without the need for disposable plastic bottles. Whether you're at the gym, office, or outdoors, this adapter ensures you can stay hydrated with your favorite Cir-kul flavors while using your trusty Stanley bottle. With its durable construction and compatibility, it's a must-have accessory for anyone looking to reduce waste and enhance their hydration experience.