SILCA 242 Gasket for Presta Chucks

72 reviews

What is it?

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.

Who's it for?

The cyclist or mechanic who is looking to bring their SILCA PRESTA CHUCK back to all of its glory by replacing the sealing gasket.

Why We Designed It | Product Specs

Why We Designed It:

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.




  • 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
  • 9mm H x 21mm OD
  • Limited Warranty


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Customer Reviews
5.0 Based on 72 Reviews
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Jay K.
United States United States
Good Stuff

I order these three at a time. When they are new, they work like a champ, but as the rubber wears down, they lead and do not hold the stem tightly and securely. I attribute that to the ribbed stems on the Conti tubes I use. I've used smooth stems in the past once in a while, and I bet the rubber would last longer if I used them exclusively. Average life expectancy is about 12-18 months, pumping up 2x tires 3-6 times per week. When they are new, they are great!

Sharon C.

Excellent replacement. Good fit in Chuck and performance is fabulous.

Heather O.

Ronald R.

charles q.
OEM part for a timeless pump

my Silca floor pump is 30 years old. I recently replaced this gasket after years of extensive use. Great to know they can be counted on to keep making parts to keep the best pumps going

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