VIAIR 400P Portable Compressor
CarCareTruth Score
Decent.
Priced as of June 1, 2026
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Prices may varyThe Podium · Top 3 in Tire Inflator
See the full ranking →This product ranks #7 of 15 in Tire Inflator.Three above it ↓
CarCareTruth's Analysis
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.
What it is and how it performs
The 400P is a 12V DC compressor rated to 150 PSI and 2.3 CFM, powered from the vehicle battery via alligator clamps. Verified-purchase reviewers 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.
Who should buy this — and who should skip it
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.
Safety and environmental impact
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.
From the manufacturer
Marketing copy from VIAIR, via Amazon. Not editorial.
- •HIGH PERFORMANCE OFFROAD COMPRESSOR (Model: 40043, 12V, 150 PSI, 35" Tires) - The 400P Portable Truck Air Compressor is 12V heavy-duty electric air compressor for offroad enthusiasts. Its powerful, direct drive gearless motor and maintenance-free operation are perfect for tackling tough terrain. Ultra-compact and storable in its own carrying case, it's an essential tool for any off-road adventure, combining reliability with convenience.
- •EXPLORE WITHOUT LIMITS: Trucks, SUVs, Jeeps, Offroad Vehicles, 4x4s, Side-by-Sides, RVs, Motorcycles, Road Bikes & Mountain Bikes. *Instructions: Attach the battery clamps to your vehicle’s battery and start the engine. Connect to a valve stem and turn the unit on. When required, use the included bicycle Presta valve adapter.
- •INCLUDED COMPONENTS: 12V mini air compressor tire inflator has a 25 ft 5-in-1 inflator/deflator air hose with inline 100 PSI gauge, 8 ft power cord, deluxe dual-compartment carry bag, 3 inflation tips (3/16" nozzle, 5/16" nozzle, and needle adapter), and Presta Valve Adapter. Features: Aluminum I-Beam sand tray, thermal overload protector, 40-Amp inline fuse holder, press-on tire chuck.
- •HIGH CAPACITY SPECS for LARGE TIRES: Powered by 12 volts, this small but mighty electric air compressor with a permanent magnetic motor delivers a maximum working pressure of 150 PSI with a 33% duty cycle @ 100 PSI; Free flow capacity: 2.3 CFM. Maximum Recommended Tire Size: 35". Fills a 35" tire from 15 to 30 PSI in 2 min. 45 sec or less. IP54 rating protects against dust and water spray from any direction. Dimensions: 10.87″L x 5.83″W x 7.48″H; 10.40 lbs.
- •DEPENDABLE QUALITY: VIAIR offroad compressors offer you the freedom to explore further and challenge boundaries. For over 25 years, our American owned and operated company has provided top-quality portable air compressors & inflators. Our commitment to durability, continuous testing, and refinement results in long-lasting performance.
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- VIAIR
- Voltage
- 12 Volts
- Recommended Uses For Product
- Tire Inflation
- Power Source
- electric-powered
- Noise Level
- 74 Decibels
- Noise
- 74 Decibels
- Additional Features
- Heavy Duty, Portable, Quick Inflation
- Maximum Power
- 414 Watts
- Capacity
- 2.3 Cubic Feet
- Maximum Current
- 30 Amps
- Air Flow Capacity
- 2.3 Cubic Feet Per Minute
- Hose Length
- 25 Feet
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