1. 【Compatibility】Our replacement gaskets for water bottle lids are perfectly compatible with Thermoflask 24oz/32oz/40oz/64oz, as well as other bottles with similar mouth caps.These thermoflask lid replacement are designed specifically for your favorite water bottle lid,allowing you to replace the water bottle gasket without purchasing a new bottle,saving you significant money. Please note that our thermos replacement parts are not sponsored or endorsed by brands including Thermoflask. 2. 【Tight Seal, Leak-proof Design】A tight seal is crucial for preventing leaks and maintaining thermal insulation in water bottles. Simply replacing the worn gasket on our bottle caps can help solve issues like leaks and insulation loss. Whether you're exercising, commuting, or traveling, replacing the thermoflask rubber seal on your bottle lid will effectively protect your belongings from water damage. 3. 【 Material and Usage】These water bottle lid gasket replacement are made from silicone, free from BPA, and can withstand temperatures ranging from -40 to 446 degrees Fahrenheit/-40 to 230 degrees Celsius. The water bottle tumbler lid gasket are durable, resistant to damage, and thermoflask o seal ring can be cleaned in the dishwasher. 4. 【Extend the Lifespan of Your Water Bottle】By using these thermoflask accessories, you can extend the lifespan of your bottle and improve the cleanliness of your drinking water. Use tweezers to gently pull out the existing thermoflask gasket and remove it. Place the lip side of the new gasket facing up for caps and facing down for spouts, then insert lid gasket into the bottle cap. We recommend replacing the bottle seal ring every 4-6 months to ensure the health of your drinking water.