Park Tool Valve Core Tool VC-1

A small, handy tool designed to remove and install Schrader and Presta valve cores and to remove and install Presta valve extenders with 5mm wrench flats.

Note: Not all Presta valve cores are removable.

Warning: California Proposition 65 

https://planet-cyclery.myshopify.com/pages/warning-california-proposition-65