VIAIR 300P vs VIAIR 400P EF

Last updated: October 22, 2026

The VIAIR 300P is the better tire inflator overall, rated 3.3 to 3.1. The VIAIR 300P leads on value. The VIAIR 400P EF wins on airflow. The VIAIR 300P costs $102.09 less ($149.95 vs $252.04).

VIAIR 300P vs VIAIR 400P EF

VIAIR 400P EF
#7 in Heavy duty3.1Full review

For off-roaders on 33 to 35 in tires who air down regularly and want quicker, longer runs than a 300P without paying for a twin. It is the sweet spot of VIAIR’s portable line.

Amazon $252.04
$252.04

Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.

Which should you buy?

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every heavy duty tire inflator; a clear win is highlighted. How we rank explains each one.

Factor weightVIAIR 300PVIAIR 400P EF
Overall rating3.3/53.1/5
Value 35%83 $149.9559 $252.04
Airflow 30%31 65.1 L/min (maker)41 73 L/min (maker)
Features 20%60 runs 30 min at a time, 150 PSI max; no auto shutoff60 runs 60 min at a time, 150 PSI max; no auto shutoff
Warranty 15%0 1-year warranty0 1-year warranty

Specifications

VIAIR 300PVIAIR 400P EF
Inflating
Max pressure150 PSI150 PSI
Airflow (maker)65.1 L/min73 L/min
Auto shutoffNoNo
Duty cycle30 min on60 min on
Noise78 dB73 dB
Power
PowerBattery clampsBattery clamps
Power bankNoNo
Power cord8 ft6 ft
Build
Air hose300 in300 in
LightNoNo
Dimensions9.0 x 4.9 x 7.5 in10.9 x 5.8 x 7.4 in
Weight8.7 lb10.3 lb
Warranty1 year1 year

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