Small, handy tool designed to make extracting Schrader and removable Presta valve cores and valve extenders simple. Specification & Features of Park Tool VC1 Valve Core Tool. 5mm wrench flats provide additional leverage, especially useful when removing cores that have been used with sealant. A perfect take along tool especially for tubeless users and people running deep section rims. Anodized in vivid Park Tool blue to make is stand out on your workbench. Park Tool VC1 Valve Core Tool is perfect for:. extracting Schrader and removable Presta valve cores and valve extenders simple.