User Friendly - The tumbler adapter is a testament to convenience; Simply attach the bottle adapter to your bottle for an easy and prompt hydration solution; It allows for versatile use and effortless operation even when outdoors Right Fit - This specially designed cap seamlessly compatible with Stanley 40oz / 64oz Quencher H2.0 FlowState tumblers; The precision of the fit enhances the functionality of the bottle and ensures the adapter stays securely in place, ruling out chances of leakage; Using this adapter will enhance your daily hydration experience Portable & Convenient & BPA Free - Take your favorite flavors anywhere with the tumbler adapter for Stanley cup to flavor cartridge. Perfect for the office, gym, outdoor adventures or car travel. This adapter turns your 40oz / 64oz tumbler cup into a flavor-infusing companion on the go Leak Proof Design : The silicone ring of the adapter lid for stanley prevents leaks and spills, keeping your drinks fresh and controlled without any hassle. The threads of the lid fit perfectly with the Stanley cup Various Activities - Whether you're at the office, in the gym, or out in nature; This water bottle adapter caters to your hydration needs making it ideal for work, fitness, outdoor activities or car travel; Have control of your refreshment intake. If you have any questions about our tumbler adapter, please contact us and I will solve them for you as soon as possible YETARAN Tumbler Adapter Compatible with Stanley to Flavor Cartridge, Fits 40oz / 64oz Stanley Quencher H2.0 FlowState Tumblers, Leak Proof Tumbler Lid Adapter with Stanley Accessories BPA Free