Fits Stanley: Looking to use your flavor cartridges with your Stanley Tumbler? Our adapter perfectly fits 40 & 64 OZ Stanley Quencher H2.0 FlowState Tumblers. No leaks, no fuss. Just a snug fit. Safe & Durable Materials: Crafted from sturdy polypropylene plastic and paired with a food-safe silicone ring. Plus, it's BPA Free, ensuring every sip you take is clean and safe from harmful chemicals. Easy Cleaning : Cleaning's a breeze! Pop our adapter in the dishwasher top shelf after using. Spend less time cleaning and more time enjoying your favorite flavors. Leakproof: No drips or spills. Our adapter's silicone ring guarantees a tight seal. Use your lid on your Stanley cup with confidence, knowing every drop stays where it should. Utilize Your Bottle: Make your Stanley even better. Twist on our adapter to your Stanley tumbler, twist the lid onto the adapter, and dive into a world of flavor.