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Untitled Document The pump head may be switched to work on Schrader or Presta inner tube valves. Remove the pump head cap at top of the head. Pull lever to help push out grommet and valve acutator stud. The acuator stud is two sided. For Schrader valves, the small end of actuator stud is inserted into the small hole in the grommet. Install this into the pump head, with grommet facing outward. Install top cap and secure. 
For Presta valves, the large end of actuator stud is inserted into the large hole of the grommet. Install this into the pump head, with grommet facing outward. Install top cap and secure. 
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