With the Simson Valve Adapter Dunlop/Presta-Schrader a bicycle tire with an Dunlop or Presta valve can be inflated with a pump which is suitable for car valves. Turn the Simson Valve Adapter on the Dunlop or Presta valve, after which the tire can be inflated with a pump which is suitable for car tires. Remove the valve adapter after inflation from the valve.