Zipp Speed Weaponry Valve Extenders for use with threaded, non-removable Presta valve tubes. Features: 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 individually Models: 27mm: Fits Zipp 202 33mm: Fits Zipp 303 48mm: Fits Zipp 60 & 404 72mm: Fits Zipp 808 98mm: Fits Zipp 1080