Package Content: You will receive 2 silicone bite valves replacement with ideal mouthpiece backups for water bottles, so you can change the biting valve of your water bottle and extend the life. Trusted Material: Water bottle mouthpiece reserves, soft and BPA -, reusable, made of first class silicone material that you can buy ly. Easy to use: First you should squeeze it under the old cup cover, then align the mouth and place it through the cup lid and finally press the mouth hard. Compliance: The size of each mouthwash is approximately 3,82x3,17 cm / 1.5x1.25 inch. Please confirm the model size first before purchasing. For Ello Cooper spare parts, this biting valve, Ello Cooper 18oz, 22oz, 32oz, 40oz stainless steel water bottle, including Ello Cooper stainless steel series is compatible with water bottles. Please note that our product is not supported by the brands it fits, including ELLO Cooper, is not approved, or that it is not related to them. Friendly suggestion: It is recommended to change the mouthpiece backup of the Ello Cooper water bottle every three months to ensure that your bottle is always in the position.