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Item: 6062800 Flow-Control Technology from Second Nature makes the valve spill-proof. Micro holes stay closed when your child isn't drinking so there are no spills. When your child drinks, the micro-holes flex open to allow liquid out. Do not use with carbonated beverages or with juices containing pulp. Clean the Second Nature Stay Kool Replacement Valves before use and be sure to insert the valve securely into the lid. Clean the Second Nature Stay Kool Replacement Valve promptly after each use. Remove the valve, then wash and rinse with hot water, or place on the top rack of a dishwasher.
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