【Easy to use】Specially designed for your Cirkul water bottle cartridges. When you don't want to use the flavor cartridge, install our bottle cap, and your Water Bottle can be used as an ordinary bottle. 【2 Pack】Keeper Cap that twists on in place of the filter when a flavor cartridge is not being used. Our cap for Cirkul is made of plastic with a special anti-slip texture design on the outside, making it easy to open and close the bottle. 【Instructions】Made of high-quality plastic, you can use it with confidence. Its simple structure makes it easy to clean. Attention : NOT recommended to put in dishwasher. Only hand wash with warm water. High temperatures can cause the bottle cap to deform. Recommended to keep upright even with the cap. Keeper Cap for Cirkul water bottle, for Cirkul flavors cartridges, for Cirkul water bottle cartridges, for Cirkul bottle water, for Cirkul water bottle flavors, for Cirkul water bottle kids, for Cirkul flavors, for Cirkull water bottle stainless steel 2 Pack Keeper Caps for Cirkul Water Bottle, Compatible with Cirkul Flavors Cartridges, Accessories for Cirkul, Essential for Circle Water Bottle, Replacement Lid Cap for Cirkul Water Bottle