Silcas nickel-plated brass Thread-On Schrader Chuck has been manufactured by the same supplier for over 25 years and will probably last even longer. The chuck attaches to any Silca hose with a hose barb on one end and female Schrader threads on the other. The chuck threads onto a Schrader valve or Silcas Stainless Presta chuck or CP1 Disc Adapter.