VIAIR 400p Automatic Air Compressor

ViairSKU: VA-40045

Sale price$389.95
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The 400P-Automatic portable air compressor is VIAIR’s first automatic shut-off function portable tire inflator. This powerful 33% duty cycle unit is capable of pressures up to 150 PSI and can be operated for up to 40 minutes at a time before needing to be rested (at up to 40 PSI). The 400P-Automatic comes with a close-ended, gas-station-style air gun for added convenience when using. 

The Benefits of Automatic Shutoff

Portable compressors with automatic shutoff are invaluable when moving from tire to tire and when checking tire pressures in the middle of a tire fill. A typical portable compressor must be turned off between tire fills and anytime you want to check tire pressure. If you aren’t near the compressor unit, this means running laps back and forth to the portable compressor to turn the unit on and off every time you need to stop and start. Automatic shutoff portable air compressors don’t require you to shut off the unit when stopping, saving you considerable time and effort and making inflating your tires nearly effortless.


Features of the VIAIR 400p Automatic Portable Air Compressor include the following:

  • Gas-station-style tire inflation gun with built-in 160 PSI gauge
  • Thermal overload protector
  • Automatic shut-off function
  • Quick connect air hose with heat shield
  • Vibration-resistant diamond-plate sand tray
  • Deluxe dual compartment carry bag
  • 40-amp inline fuse holder
  • Dual battery clamps
  • 3 pc. inflation tips kit

Product Specifictions

  • 12-Volt
  • Permanent magnetic motor
  • Duty Cycle: 33% @ 100 PSI
  • Working Pressure: 150 PSI
  • Amp Draw: 30 Amps
  • Ingress Protection Rating: IP54
  • Dimensions: 10.87″L x 5.83″W x 7.48″H
  • Net Weight: 10.70 lbs.
  • Power Cord Length: 8 ft.
  • Air Hose Length: 30 ft. 

Please note the following:

The air hose supplied with this kit may become brittle from prolonged exposure to UV/sunlight. Stow the hose away from light when not in use. Never allow the hose to make contact with the compressor head during use as this is a melting hazard. The use of the included air hose is not recommended in subzero or freezing conditions. The 400P does not work with Presta bicycle valves, unless used with a Presta Valve Adapter. The 400P does not work with the VIAIR Winterization Kit (P/N 90145).

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