Park Tool VC-1 Valve Core Tool. The Park Tool VC-1 is a small handy tool designed to remove and install Schrader and Presta valve cores as well as Presta valve extenders with 5 mm wrench flats. Helpful for setting up tubeless tires replacing damaged or leaking valve cores or rapidly letting air out of large-volume tires.
Note: Not all Presta valve cores are removable
