The Clik Valve system makes inflating bicycle tires easier than ever before, by simply replacing your existing presta valve cores, combined with a matching Clik Valve Pump Head or Pump Head adapter. Minimal effort is needed - thanks to the intuitive click system that creates a secure connection between the pump head and valve. The Clik Valve design greatly reduces risk of air loss during the inflation process and minimizes wear on the pump head itself. Includes one pair of Clik Valve cores for retrofitting existing valvesClik Valve Pump Head Adapter for use with non-Clik Valve pump headsWhile not optimal, Clik Valves can be inflated with presta valve pump heads that utilize a rubber gasket compression fit (threaded pumps heads won't work) SKS Clik Valve Conversion Kits Valve Part UPC: 4002556159535