Silca Presta Chuck 17-4

Silca hoses, heads and adapters for bicycle pumps.

• 17-4 Stainless Material - 6 times the strength and 2 times the hardness of Brass
• Full synthetic Elastomer 242 Gasket
• New Two-Stage gasket sealing geometry optimized for all Presta valve stems
• Pressure amplifying dome geometry uses air pressure to clamp valve stem
• Schrader valve threads on the hose side thread into any Schrader compatible hose attachment
• Hand-crafted with pride in Indianapolis, USA