CarCareTruth Score
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Prices may varyThis product ranks #5 of 21 in Tire Inflator.Three above it ↓
Last reviewed June 1, 2026
TL;DR Multiple community-timed fills on 33-inch off-road tires consistently came in under 3 minutes per tire, suggesting standard passenger-car fills well within that mark. No independent reference-gauge cross-check was found; gauge accuracy is unverified · carry a backup gauge.
The VIAIR 300P is a 12V direct-battery compressor (alligator clamps) rated to 150 PSI. Two verified owners report reliable use after 10 and 12 years of regular trail service. It handles high-pressure work without thermal shutdown: community data shows four RV tires at 110 PSI in about 10 minutes. The inline gauge reads only when the motor is off · keep a stick gauge for precise checks.
Best for truck, SUV, and off-road owners who need confirmed high-PSI capability and long-term durability. The alligator clamps require hood access · no cigarette-lighter option. For quick passenger-car inflation with auto-shutoff, look at cordless alternatives.
No UL or ETL certification was confirmed in database searches; no active CPSC recall is on file. As a corded 12V unit it generates no battery-disposal burden; dispose at any municipal e-waste facility at end of life.
Marketing copy from VIAIR, via Amazon. Not editorial.
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