Silca Elastomer Seal for Presta Chuck #242 Replacement elastomer gaskets for old or new SILCA pumps that offer a longer life expectancy than traditional rubber. Utilizes a high-tech, fully synthetic elastomer base material Features five times 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 New Two-Stage sealing geometry optimized for all Presta valve stems Pressure amplifying dome geometry uses air pressure to clamp valve stem Fits all SILCA Presta heads Made in USA Silca Elastomer Seal for Disc Chuck #252 Replacement elastomer gaskets for old or new SILCA pumps that offer a longer life expectancy than traditional rubber. Utilizes a high-tech, fully synthetic elastomer base material Features five times the durability of traditional rubber materials New Two-Stage sealing geometry optimized for all Presta valve stems Fits all older SILCA disc wheel adapter versions (though at reduced max hands-free pressure) New Two-Stage sealing geometry optimized for all Presta valve stems Silca Elastomer Seal for Reversible Chuck and Impero Head #323 Replacement elastomer gaskets for old or new SILCA pumps that offer a longer life expectancy than traditional rubber. Utilizes a high-tech, fully synthetic elastomer base material Features five times the durability of traditional rubber materials Used in three original brass chucks (Art.24.4, Art.84 and Art.323) Used in Impero frame pumps Can be flipped for Presta or Schrader (brass chucks only)
