SILCA 242 Gasket for Presta Chucks
• Synthetic elastomer base material
• 5X the durability of traditional rubber
• Two-Stage sealing geometry
optimized for all Presta valve stems
• Pressure amplifying dome geometry
uses air pressure to clamp valve stem
• Fits all bell-shaped SILCA Presta heads
• 9mm H x 21mm OD
SILCA LIMITED WARRANTY
Parts covered by SILCA Limited Warranty are considered to be subject to wear through normal use or are consumable subject to degradation through the course of their daily use. SILCA guarantees them free from manufacturer defects for 2 years.
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.