These one way valves are drinking aids that are fitted onto the bottom of drinking straws. They allow liquid to flow up the straw when sucked, but liquid does not flow back down when the drinker releases suction from the top of the straw. This is especially useful for individuals who are learning or re-learning how to drink effectively through a straw. They can be used effective for those with a weak suction, or for those who aspirate. Set of 3 valves. Drinking straws and bottle not included. #40933
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