Zipp valve extenders for use with removable presta value tubes.

• For use with removable valve core presta tubes
• Works with Zipp butyl inner tubes with a removable core as well as other leading tubular tires and inner tubes that have removable cores
• Knurled end to keep pump from slipping
• 3mm hex broach in the barrel to guarantee a perfect seal when tightened
• Integrated air seal