Steel construction and replaceable internals provide long-term durability. Auto-select head instantly fits both Presta and Schrader valves. Large, stable base minimizes tipping. Easy to read 4� base-mounted gauge. Base-mounted switch allows for easy transition between high volume and high pressure settings. High volume setting allows for quick inflation. High pressure setting allows for easy inflation as PSI increases. Max pressure 160 psi (11bar).