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Presta Valve Adapter Feature: 1. Convert a Presta valve to a Schrader valve 2. Turn a UK valve into a US valve 3. Inflate your tires with Presta Valves using any "standard" Schrader Valve bike pump 4. Prevent leakage, dirt and rain water to extend the service life of bike tires. 5. Rocket shape makes the bike look more attractive and special. 6. Best replacement for your old or broken one. 7. Direct replacement,easy to install, only use the wrench to put the caps onto the tire valve stem. 8. Can be left on the tire stem so it is always available to inflate your tires 9. Fit for: mountain bike, road bike, folding bike, especially for mountain bikes. 10. QUALITY: aluminum alloy with rubber o-ring seal. Package Include: 6 Black Presta Valve Adapter 6 Red Presta Valve Adapter