The Iconic SILCA Presta Chuck in aluminum utilizes the highly efficient push-on design to securely seal on Presta valves with no levers or buttons. A Two-Stage seal geometry seals on both the valve stem and at the base of valve core threads resulting in a more positive seal and improved durability. The new gasket slips onto the valve stem with a positive and satisfying 'click', while unique internal geometry actually utilizes line air pressure to compress the gasket onto the valve stem: the higher you pump, the harder it grips the stem! Features: Iconic Silca Presta Head Design - in use by more pro team and shop mechanics than any other! Full Synthetic Elastomer 242 Gasket 5X the durability of traditional rubber materials Pressure amplifying dome geometry uses air pressure to clamp valve stem Schrader valve thread on hose side threads into any Schrader compatible hose attachment Hand-Crafted with pride in Indianapolis, USA
