Serfas MP-2N1 2 in 1 Shock Mini Pump Capable of getting you to extremely precise inflation pressures The switch valve & simple valve designs enable switching between Presta or Schrader valves, while the dual head offers both Our simple screw-on and Quick draw head designs both screw on the valve for a secure fit, even at high inflation pressures 2 in 1 shock and tire pump Alloy construction with large pressure gauge Hi/Lo switch to customize inflation speed Air release for fine tuning pressure PSI Capacity 300