Park tool valve core tool vc1the vc1 is asmall handy tool that is designed to remove and install schrader and presta valve cores and to remove and install presta valve extenders with 5mm wrench flats it is made from cnc aluminium finished in pak tool blue and built to last notenot all presta valve cores are removable features removes cores on presta and schrader valvesbuypark tool workshopfrom chain reaction cycles the worlds largest online bike store