Viair 300P Vs. 400P – What’s the Difference?

As an Amazon Associate, I earn from qualifying purchases

The amount of air in our tires can affect their performance and the overall performance of your car.

Tires should have the right amount of air because if it has too much or too little air, it could impose danger on your drives.

To avoid this problem from happening there is an easy and economical solution. And this solution is portable compressors.

There are tons of compressors in the market, but Viair has managed to manufacture one of the best ones.

And when you talk about Viair compressor, the Viair 300P and 400P immediately come to mind.

But between the Viair 300P vs. 400P, which one should you choose? If you’re not sure just yet, this article is here to help you out.

Difference Between Viair 300P and 400P Portable Compressor 

Viair 300PViair 400P
PROS1. Easily portable and lightweight

2. Works with any vehicle with a 12V battery

3. Pumps air in minimum time

4. Can be used on tires up to 33 inches

5. Easy to use
1. Compatible with vehicles using 12V batteries

2. Longer hose length

3. Maximum working pressure of 150 PSI

4. Can inflate a tire in less than 5 minutes

5. Capable of inflating up to 35-inch tires
CONS1. Its clamp-on tire chuck is too deep.1. Bulkier and heavier

Choosing between these two is very tricky since they have several similarities.

But they also have advantages and disadvantages of their own. So, you can make a better decision, it’s best to have a closer look at their main differences.

Vehicle Compatibility and Tire Size

You can use both of these compressors on any vehicle as long as a 12V battery powers them.

And they’re also capable of inflating most tire sizes. The Viair 300P can inflate up to 33-inch tires while the Viair 400P can inflate even bigger ones having diameters of up to 35-inches.


These compressors are easy to store in your trunks. But you may need to reserve some extra space for the Viair 400P because it is bulky.

When it comes to weight, the Viair 300P weighs lighter than the 400P, making it easier to hand carry around whenever you want to transfer its location.


The procedure when using these compressors are closely similar and very straightforward that you can do it all by yourself.

They also have the same hose lengths of 25 feet to reach all your tires to inflate them quickly.

Inflation Rates

No one wants to spend too much of their time waiting for their tires to fill up with enough air, so the inflation rate is an essential factor to consider.

In terms of the inflation rate, the Viair 400P has the advantage of faster speed.

Viair 300P

Viair 300P Air Compressor Kit

Wherever you’re driving to, it’s always best to have an air compressor in your trunk. And with the Viair 300P, you’ll always be prepared to pump air into your tires whenever they’re low.

This compressor comes in a small size, so it won’t take up too much space, weighing less than two pounds.

It can inflate tires of different sizes up to 33 inches. And using it is also not too complicated, there are also instructions which you can follow should you have any trouble.

All you’ll have to do is attach it to the battery using alligator clamps and the chuck to the tire valve. After that, you can go ahead and turn on the compressor.

This compressor will work well with all vehicles that use a 12V battery. If you want to check the pressure inside your tires, use the 5-in-1 inflator/deflator inline pressure gauge.

You’ll be able to get your tires at their top condition with this compressor. And you won’t even have to break your bank for it.

Latest Comparison: Viair 88P Vs. 300P

Viair 400P

Viair 400P Portable Compressor

This air compressor is closely similar to the 300P from Viair. One of their similarities is that they are compatible for use with any car that uses 12V batteries. Although it is bulkier and its weight is slightly more than the 300P compressor.

The maximum pressure that this can work with is up to 150 PSI at a duty cycle of 33%. Using this will require the same procedure as the 300P.

It is very convenient to use, and you’ll be able to get your tires inflated in no time so you can get back on the road.

In less than 5 minutes, you’ll be able to inflate your tires, even if it has a larger diameter.

You can use this for tires that are as large as 35 inches in diameter. Another great feature this has is its durable dual battery clamps that come with a 40 Ampere inline fuse.

Its hose length is considerably long-spanning up to 25 feet, so you inflate all of your tires quickly. Overall, it’s a handy air compressor to have.

Related Guide: Black Oak LED vs. Rigidc

Frequently Asked Questions

How much is the correct pressure for my tires?

The recommended pressure for tires, in general, is within the range of 32 to 35 PSI.

So, you can make sure that the needed pressure for your tire is more accurate, it’s best to check its specification.

What can I do to maintain my air compressor?

You can do a lot to maintain your air compressor. Some of these include ensuring that the nuts and bolts are tightened, inspecting the hoses, cleaning the intake valves, and changing its air filter.

Is it okay to keep my engine on when using the compressor?

Yes, it is okay to keep your engine turned on when using your air compressor.

Up to how much PSI can a tire handle before exploding?

Tires generally have a pressure limit before they explode. This pressure limit is approximately 200 PSI.

What will happen if my tires are over-inflated?

Your tires will lose traction and wear down the center of the tread faster if they are over-inflated.

Final Words

Choosing between the Viair 300P vs. 400P is a difficult thing to do. They both perform very well.

The decision will have to depend on your tire size, your budget, and your preferred design.