VIAIR 400P
- Air
- Corded electric
- 10.4 pounds
- 12 volts
- Better rated than 80%
- More reviewed than 89%
A 12 volt portable compressor with enough weight and power source to handle larger tire airing jobs on the road.
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How it ranks among the 94 airs we track
4.7★ across 1,600 Amazon ratings, Bayesian-smoothed toward the category average.
1,600 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
50+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 94 airs we track - how the scorecard works · full airs data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The VIAIR 400P is a portable 12 volt electric air compressor weighing 10.4 pounds, built for airing up tires away from a shop compressor.
VIAIR's compressors are a common choice for topping off truck, SUV, and trailer tires from a vehicle's own electrical system rather than hauling around a shop unit. At over 10 pounds it sits on the heavier end for a portable unit, which typically points to a higher air output than smaller emergency inflators.
- Electric powered
- 12 volt operation
- 10.4 pound weight
- VIAIR brand
Who it's for
Good for a truck, RV, or trailer owner who wants to air up larger tires on the road without a garage compressor. Less suited to someone who only needs an occasional quick top off on a passenger car tire, where a smaller and lighter inflator would be easier to store.
Strengths and trade-offs
Drawn from this product's published specifications.
- 12 volt operation works directly off a vehicle's power
- Weight suggests stronger output than compact inflators
- Suited to larger truck and trailer tires
- Heavier and bulkier than compact emergency inflators
- Exact air output (CFM or PSI) not listed here
Performance notes
Running off a 12 volt electric supply, the 400P draws power directly from a vehicle battery or outlet, and its 10.4 pound build suggests a larger motor and pump than compact emergency inflators, translating to faster fill times on bigger tires.
Specifications
| Brand | VIAIR |
|---|---|
| Model | 400P |
| Power Source | Corded electric |
| Item Weight | 10.4 pounds |
| Voltage | 12 volts |
Other VIAIR airs
How it compares
This product against the closest alternatives we track in airs.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| VIAIR 400PThis product | 4.7 / 5 | 1,600 | 4.2 / 5 |
| DEWALT DCC020IB AirDeWalt | 4.6 / 5 | 18,000 | 4.6 / 5 |
| OlarHike TIC3V401 AirOlarHike | 4.5 / 5 | 5,100 | 4.5 / 5 |
| Xiaomi BHR7112GL AirXiaomi | 4.6 / 5 | 8,236 | 4.4 / 5 |
| Bostitch BXCM02012-WPK AirBOSTITCH | 4.7 / 5 | 1,900 | 4.3 / 5 |
Similar airs from other brands
Questions about the VIAIR 400P
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What power source does the VIAIR 400P use?
It runs on 12 volt electric power, typically from a vehicle's system.
How much does it weigh?
10.4 pounds.
Is this a compact emergency inflator?
No, its weight suggests a larger pump built for tougher airing jobs than small emergency units.