Viair 300p vs 400p: Which Air Compressor is Perfect for You

It is very important to have a good amount of air on the tires to extend the life of the tires or to have better control over your vehicle and a good tire inflator or a small air compressor helps you to do that.

Apart from inflation if you have an RV then you also need an air compressor which helps to winterize your RV’s pipelines.

So in this article, we have done a detailed comparison between the two best inflators those are Viair 300p vs 400p. These are two best-selling portable air compressors from Viair. Those are small as well as powerful which helps not only for the inflation process but also helps for blowing out your RV pipelines.

So without any further delay let’s take a look at their detailed reviews along with the comparison.

Reviews of Viair 300p vs Viair 400p

Here we have reviewed both their best-selling portable compressors with their pros and cons which helps you choose the perfect air compressor from both, Viair 400p or Viair 300p.

VIAIR 300P Portable Compressor – 30033

This is one of the best-selling air compressors which comes with lots of advanced functions with a powerful motor. So let’s see all of the features in detail and also discussed their advantages and disadvantages.

This is a 12Volt air compressor which makes it perfect for travelers and the best part is that this compressor also supports 24V automotive applications. So the bottom line is that it supports dual voltage.

This Viair air compressor also has a maximum working pressure of 150 PSI which makes it quite powerful and it can inflate the maximum tire size up to 245/70R19.5. And to airing from 80 to 90 PSI, it takes 44 seconds to do that.

This compressor is capable to deliver the air for 20 minutes continuously for 100 PSI at 0.85 CFM after that it requires rest for 40 minutes. This means it has a 33% duty cycle at 100 PSI of air pressure.

It is equipped with a powerful permanent magnet motor that can deliver the maximum airflow of 2.30 CFM at 0 PSI which makes it quite efficient for vehicles.

For single tires, it’s ok and good enough but not for dual tires. The air hose available on this air compressor is not suitable for dual tire trucks because its 45-degree extendable chuck is unavailable.

It is equipped with 30 feet of long air hose so need to think about whether the length is perfect for your vehicle or not because if not then you need to add an additional air hose as per your convenience.

An alligator clip is also available so you can directly be connected with the battery to operate this inflator.

This Viair 300 has an in-line pressure gauge of up to 150 PSI with an inflator deflator hose. Which helps to measure the tire air pressure easily.  

At last, if you want a compressor for winterize or blow out all the pipelines of your RV then this Viair 300p model is not operable.

Pros and Cons


  • Super affordable as compared to the 400p model.
  • Good for medium size of tires.
  • Supports dual voltage 12V as well as 24V.
  • Lightweight and easy to carry.
  • A metal plate is available for better stability.
  • A carry bag is also available.


  • A 45-degree extendable chuck is unavailable.
  • Not good for dual tires.
  • Only 30 feet of the air hose is available.

Who should buy this?

So This Viair 300 is good for the maximum tire size up to 245/70R19.5. But because it has no 45-degree extendable chuck it’s also not a good option for dual tires. But it’s much more affordable than a 400p inflator.

Read More: Best portable air compressor for bike tires

Read More: Best Air Compressor for RV

VIAIR 400P Portable Compressor

This is also the best selling inflator from Viair which comes with all the advanced functions with a powerful motor. This air compressor is the upgraded version of Viair 300p. So let’s see all the functions in detail with their pros and cons.

This is also equipped with a permanent magnet motor that supports dual voltage 12V as well as 24V. Which makes it perfect to use for a wide range of applications. An alligator clip is also available with this air compressor which helps connect this inflator directly from the battery.

This air compressor can be operated with a maximum air pressure of 150 PSI which makes it quite powerful and inflator your car tire faster as compared to the 300 models.

This air compressor can deliver the highest airflow of 2.54 CFM at 0 PSI and 1.19 CFM at 100 PSI this is the main difference in the power of both air compressors. And the duty cycle is the same that is 33%.

This tire inflator can inflate the max tire size up to 275/80R 22.5 and it tasks 1.38 minutes from 80 to 90 PSI. So it can inflate the heavy tire faster.

With this air compressor, you will get 60 feet of air hose which makes it more convenient to use for long trolleys. And an extra 45-degree extendable chuck is also available which makes it perfect for dual tires.

This 400p model 150 PSI of pressure gauge is equipped with a gas station-style airing gun in addition to a 40-inch extendable chuck, which makes it quite comfortable for the inflation process.

Apart from the inflation of tires if you also need a compressor for the winterization of your RV then the Viair winterization kit easily works with the Viair 400p model.

Pros and Cons


  • Deliver large volume of air at 100 PSI as compared to 300p model.
  • Good for large and dual tires.
  • Has additional 45-degree extendable chuck.
  • 60 feet of air hose available.
  • It can be also used for winterization.
  • For stability, the metal plate is also available.


  • Little heavier.
  • Expensive.

Who should buy this?

So 400p model is an expensive option available which is good for inflation of larger tires as well as good for winterization too.

Read More: Best Air Compressor for Heavy Duty Trucks

Comparison Between Viair 300p vs Viair 400p

Viair 400p or Viair 300p: What to Choose?

After the in-depth reviews of both these air compressors here, we have prepared a compression table of both the inflators.

SpecificationsViair 300pViair 400p
Max Operating Pressure150 PSI150 PSI
CFM Rating2.40 CFM at 0 PSI,
0.85 CFM at 100 PSI
2.54 CFM at 0 PSI,
1.19 CFM at 100 PSI
Duty Cycle33% 33%
Voltage Required12V or 24V 12V or 24V
Max Tire SizeUp to 245/70R19.5Up to 275/80R 22.5
Air Hose Length30 Feet60 Feet
45-Degree Extendable ChuckUnavailable Available
For WinterizationNot GoodGood
Check PriceCheck Price

Who Should choose Viair 300p?

  • Viair 300p is good for those who have a low budget and easily inflate the tire size up to 245/70R19.5.
  • It comes with 30 feet of air hose so if you require more than that then you need to buy extra.
  • 45-degree extendable chuck is not available so for dual tires it’s a little difficult to inflate.
  • Has inline pressure gauge with inflator deflator hose.
  • Not good for the winterization process.

So if these points support your thought then you can go with these air compressors.

Who Should choose Viair 400p?

  • It is quite expensive but more powerful and equipped with some extra accessories too.
  • It can easily inflate the large tire up to 275/80R 22.5. 
  • Comes with 60 feet of long air hose which is long enough and you can comfortably inflate all the tires of your vehicle without any hassle.
  • Here 45-degree extendable chuck is available so you can comfortably inflate the dual tires too.
  • A gas station-style airing gun is available with a pressure gauge.
  • Perefct air compressor for Viair winterizitaion kit.

So if the budget allows you then definitely go with this model.

FAQs for Difference Between Viair 300p and 400p

FAQs for Viair 300p vs 400p
FAQs for Comparisson between Viair 300p and Viair 400p

1. How long do Viair compressors last?

Viair is a very famous brand for inflators they always believe in quality products. And it actually depends on your usage if you use it properly and control the heating issue then it can easily last for 5 to 10 years.

2. Do Viair compressors get hot?

Viair tire inflators are small in size and yes, they are getting hot. Some tire inflators can provide a 33% to 100% duty cycle. So according to their duty cycle, you can operate these tire inflators.

Our Opinion: Which one you should buy Viair 400p or Viair 300p

So after comparing both air compressors between Viair 300p vs 400p We have come to the conclusion that if budget allows you then choose Viair 400p. But if you have a low budget then Viair 300p is also good to inflate tires but remember it’s not a good option for winterization.

So Which air compressor can fulfill your requirements? Let me know in the comment box.

So guys If you liked this post don’t forget to share.

By the way, thanks for visiting.

Hi. This is Subhadip. I am a Mechanical Engineer and I have been working in mechanical Industries for more than 3 years. I have expertise in several kinds of Mechanical Devices and Air Compressor is one of them. So I am here to help you find the best air compressor for your desired need.

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