Silca Elastomer Gasket

SILCA ELASTOMER GASKET PRESTA CHUCKS #242 The Iconic SILCA 24.1 gasket is the heart of the press-on Presta chuck. The current 242 gasket utilizes a high tech and very red, fully synthetic elastomer base material. The cyclist or mechanic who is looking to bring their SILCA Presta Chuck back to all of its glory by replacing the sealing gasket. This unique bright red gasket borrows from industries which require air-tight seals in the harshest of environments. It 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 gasket slips onto the valve stem with a satisfying click, while unique internal geometry actually utilizes line air pressure to compress the gasket onto the valve stem: the higher the pressure, the tighter the seal. This design is so iconic we've found more than 20 companies world-wide making pump heads and gaskets copied from this, but none of them can come close to the precision and technology of the SILCA 242. SPECIFICATIONS: Full 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.