CarCareTruth Score
Decent.
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Prices may varyThis product ranks #9 of 21 in Tire Inflator.Three above it ↓
Last reviewed June 1, 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 was confirmed in available sources; a full 5-lookup database search was not performed. No active CPSC recall was found. Corded 12V unit; recycle at municipal e-waste at end of life.
Marketing copy from VIAIR, via Amazon. Not editorial.
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