Specifically designed to work with Tangente (or other) tubes that have a removable Presta valve core and sized for Zipp wheel/rim profiles when mated to a 37mm valveO-ring core-tip sealing and secure inflation by relocating stock Presta core to the end of the extenderTangente valve wrench for installation/removal sold separately (ZP-5569) Mfr#:00.1915.097.030