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Silca Presta Chuck Washer

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Average connection time 25 secs

Average connection time 25 secs

The seal utilizes a high tech and very red, fully synthetic elastomer base material rather than a carbon black filled natural rubber of previous seals. This unique bright red seal borrows from industries which require air-tight seals in the harshest of environments, and tests to a life expectancy of more than 5X the carbon filled rubber or Buna-N materials used previously. New Two-Stage seal geometry seals on both valve stem and at the base of valve core threads resulting in a more positive seal and improved durability. The new seal slips onto the valve stem with a satisfying 'click', while unique internal geometry actually utilizes line air pressure to compress the seal onto the valve stem: the higher you pump, the harder it grips the stem!

This design is so iconic we've found more than 20 companies world-wide making pump heads and seals copied from this, but none of them can come close to the precision and technology in our new seal.

Key Features:
Fully Synthetic Elastomer Base Material
5X the durability of traditional rubber materials
New Two-Stage sealing geometry optimized for all Presta valve stems
Pressure amplifying dome geometry uses air pressure to clamp valve stem
Fits all prior SILCA Presta heads
Made in USA

Brand:
Silca

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