Zipp Speed Weaponry valve extenders for use with threaded, non-removable presta value tubes.
- For use with threaded presta (non-removable core) tubes
- Extenders thread "over" an existing valve and do not "replace" a valve core
- Knurled end to keep pump from slipping
- 3mm hex broach in the barrel to guarantee a perfect seal when tightened
- Sold each