This unique bright red seal is inspired by industries that demand airtight seals in the harshest environments. It lasts more than 5 times longer than the carbon-filled rubber or Buna-N materials previously used. The new two-stage seal geometry seals both on the valve stem and at the base of the valve core threads, providing a more positive seal and improved durability. The new seal slides onto the valve stem with a satisfying “click”, while the unique internal geometry actually uses the air pressure of the line to compress the seal onto the valve stem: the higher the pressure, the tighter the seal. This design is so iconic that we’ve found over 20 companies worldwide making pumpheads and seals copied from it, but none of them can come close to the precision and technology of the SILCA 242.
Features:
– Synthetic elastomer base material
– Durability 5 times greater than traditional rubber
– Two-stage sealing geometry
optimized for all Presta valve stems
– Pressure-amplifying dome geometry
uses air pressure to tighten the valve stem
– Fits all SILCA bell-shaped Presta heads
– 9 mm height x 21 mm outside diameter
