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The Lezyne Twin Speed Drive CO2 Inflator has a name that's slightly misleading, we'll admit. The inflator doesn't enable double inflation speeds (as though the virtually instantaneous process of inflating your tires with CO2 cartridges wasn't fast enough), but it does have a dual-head design that can fit Presta or Schrader valves and also allows you to replace O-rings when necessary, so you don't get a leaky seal when pumping up. The inflator includes a little cartridge jacket, too, so you don't freeze your fingers off when using it.