Product compatibility: Our Adapter designed for Owala FreeSip 24/25/32/40oz,Ensure a perfect fit with the Adapter for Owala FreeSip to Cirkul. Product Material: This adapter is made of plastic that does not contain bisphenol A and a food grade silicone structure to ensure that harmful chemicals do not seep into the beverage, making it reusable and reducing waste. Leak proof design: The sealing ring can prevent leakage and overflow, keeping your beverage fresh and controllable without causing any trouble. Easy to use: Simply attach the adapter to your Owala FreeSip cup, insert the Cirkul flavor cartridge, and enjoy your customized drink in seconds.Easy to install and convenient to clean. Perfect after-sales service: If you have any questions about our products, please contact us and I will solve them for you as soon as possible. (Please note: this adapter is only compatible with the Owala FreeSip 24/25/32/40oz to Cirkul! Bottle and lid are not included. Any mention of the brand is for compatibility purposes only.) Water Bottle Adapter for Owala FreeSip to Cirkul