CarCareTruth Score
Decent.
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Prices may varyThis product ranks #5 of 15 in Tire Inflator.Three above it ↓
Last reviewed August 12, 2026
TL;DR Multiple community timing tests on large off-road tires confirm fast fills consistent with the manufacturer's claim. No independent reference-gauge cross-check was found; gauge accuracy is unverified.
The 400P is a 12V DC compressor rated to 150 PSI and 2.3 CFM, powered from the vehicle battery via alligator clamps. owners on 33-inch off-road tires reported 17-to-36 PSI fills in under a minute per tire. No thermal shutoffs were documented during multi-tire sessions. Highly rated on Amazon by a large owner base; IP54 housing and VIAIR's 25-year track record signal above-average durability.
Built for truck and SUV owners who inflate 33- to 35-inch tires and want a serious trunk kit with a full 25-foot hose. Skip it if you need preset auto-shutoff or a backlit digital gauge; a cordless inflator with a digital pressure preset fits that use case better.
No third-party electrical certification exists for this unit. A full five-database search on 2026-08-12 (UL Product iQ, the Intertek ETL directory, the CPSC recall database, and VIAIR's own product page and operator manual) returned no UL, ETL or CE listing and no active recall. The listing carries a California Proposition 65 warning, which is scored as a health deduction. Corded 12V unit; recycle at municipal e-waste at end of life.
The Amazon listing for VIAIR 400P Portable Compressor carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including electronics with wiring, solder joints, or plastic/metal housings — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive electronics product, VIAIR 400P Portable Compressor has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from VIAIR, via Amazon. Not editorial.
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