VIAIR 400P Portable Air Compressor - Perfect for On-The-Go Tire Inflation

Raymond Winstead: Quiet strong and fast to raise pressure. Worth the price if you need more than the typical 35psi.

United States on Sep 19, 2023

Average Dick: This is a quality unit. I pull it out and the ladies go ooooh lala. Seriously, this is good enough to satisfy your father that never gives you a compliment or recognizes your existence.

Canada on Sep 18, 2023

Eric K.: The VIAIR 400P portable air compressor is a game-changer in the world of on-the-go inflation. With its impressive power and user-friendly design, it's become an essential tool in my automotive arsenal.

The first thing that struck me was its sheer power. Capable of reaching a maximum pressure of 150 PSI, the 400P effortlessly handled my car tires, bike tires, and even inflatable water toys. Its fast inflation speed meant I spent less time waiting and more time enjoying my outdoor activities.

Portability is a strong suit for the 400P. Its compact size and ergonomic handle made it a breeze to carry around, and the included carry bag added an extra layer of convenience. Whether I'm on a road trip or a weekend camping adventure, the 400P is always ready to assist.

The built-in pressure gauge is a nifty feature, allowing me to monitor and adjust inflation with precision. The integrated LED work light proved to be incredibly handy during nighttime use, making the whole process smoother and more efficient.

While not whisper-quiet, the 400P's noise level is manageable, making it suitable for various settings without causing a disturbance.

In summary, the...

United States on Aug 11, 2023

Drew: Good value & quality product for price range.
Easy to setup operate and quick inflation and deflation of 4x4 tyres.
Long hose and fairly accurate tyre pressure gauge.
Postage quick and hassle free

Australia on Apr 01, 2023

Le: Works on my 22.5 motorhome wheels, how long it will las,t I will just have to wait and see

Canada on Aug 20, 2022

Linda’s lowdown.: The product arrived well packaged and easy instructions. The carry case is extremely well made with separate pockets for the compressor and bits. Connecting to the battery is easy and the hose is more than long enough for my 20 ft camper. It works well and is accurate. One odd thing which could be a safer feature or it assumes that we have long arms is the positioning of the on/off switch. When the compressor is connected to the battery and the hose to the back tyre the pressure gauge is near the tyre and the on off switch on the compressor??? I switched it on briefly walked to the back cane back etc. Now it could be that there is an on off lever or attachment to regulate pressure near the gauge but I haven’t got one. Maybe a safety feature???? I still like it though. Solidly made. Easily portable.

Canada on Jul 18, 2021

Amazon Customer: Aired down four tires for offroad (from 65 psi to 30psi). When it was time to air back up again to 65 psi all around, it took about 4 minutes per tire. This could be easily done without the unit needing to cool down. It has about a 20 minute run time per hour, which is enough to fully air up 4 tires. It is relatively quiet and has good reach for a 20 foot pickup. You don't need to move the unit to reach all four tires. The hose is long enough in addition to the long battery cables. Nice carry case too, that will fit a set of Coyote automatic deflators (which makes the air-down job incredibly easy and fast and accurate to whatever you choose for a preset deflation limit). Portable, small footprint, and very well built. Worth it. Don't go offroad without it.

United States on Jun 14, 2021

James C.: After paying $2 to inflate 4 tires at a gas station decided to buy my own inflator. After weighing cost/benefit options chose the Viair 400P. Initially balked at the price but I hate crappy products. Any worry about my choice disappeared with a thorough inspection. Buying online can be a crapshoot but this unit is quality built. Bag is medium grade and could use a third small compartment for filters and extras but a minor issue, also the instructions are in tiny print and hard to read for us old geezers. Showed the 400P to my mechanic and he was very impressed. His first comment was wow even the hose is high quality! Never thought I'd be excited to inflate tires but using a quality tool like this is a pleasure. This pump is fast, easy to use and has a nice sound to it. The pressure gauge as others have noted did not seem accurate. An issue for cars with short valve stems is the horizontal inflator chuck won't fit unless you have enough clearance above wheel cover surface. I bought a 6" flexible valve extension which solves the problem.
Read some reviews complain of the 8' power cord as too short. Easy hack is use your jumper cables as extensions. A decent 16' 4 gauge cable will...

Canada on Sep 01, 2020

iykjg: I first purchased a Viair 88P from amazon. When I received it the unit did not work properly out of the box. I immediately returned it to Amazon because of a factory defect and decided to order the 400P model because of its greater capacity to move air. I tested it on a SR225-75 large travel trailer tire as soon as I received the unit and was pleased with the results. It inflated the tire to 55psi in about 3 minutes. The cylinder was warm but not hot to the touch. The unit is larger and heavier than the 88P but was worth it because of its much greater capacity to get the job done. It comes with a cloth case that is adequate but not what you would consider heavy duty. It does keep all of the components in one place when needed. The size of the 400P in its case is to large to place under most passenger car seats but could be stored in the trunk or pickup truck tool box. If the components were separated without the case, they might fit under some passenger car seats. The removable air hose is coiled and compact and easily stretched out from the front of my 38' RV to the rear tires. Since it is equipped with an industrial type hose quick connector other hoses or extensions could be...

United States on Jan 17, 2018

Steve: Short version....
I bought this to use with my 31 ft. Class C motorhome and found that it really was not suitable for that application.
The air line is too short and the type of chuck (locking and non-interchangeable) does not work well for dually tires. For cars, trucks, SUVs and other vehicles, this product should work well.
I want to be clear that my bad experience with the product was the result of my choosing the wrong product and then trying to force it to do what it isn't suited to do.

Long version...
Bought this in an attempt to go cheaper than the 400P Auto RV version. When I aired up my front tire, it worked like a charm. It got the tire from 70 to 80 psi in less than a minute. However, when I tried to air up an inside dually tire, things went very wrong. With the locking chuck, the only way you'll get to the inside dually is with an air stem extension..which I had. Although the coiled line is listed as 30 ft, you really can't get anywhere near that distance because of the coiling. I had to pull it a little tight to get it to the rear tires. I clamped the chuck on the stem extension and let go of it to go turn the unit on. When I got back to the rear...

United States on May 30, 2016