VIAIR 400P - 40045, Automatic Function Portable Compressor Kit, Tire Pump, Truck/SUV Tire Inflator, Silver, For up to 35 Inch Tires

Viair is top of the line as far as I’m concerned. It is well built and constructed with quality components. This is my second unit. I also have one for my RV. I tried this unit out today and I am dutifully impressed. The gauge is spot on accurate so no need to double check the pressure with a small handheld gauge. It seems to be quieter than my older unit and it is also smaller and lighter. This 400P Automatic is the way to go because it has a built-in PSI regulator that turns the unit off when it is not being used. Meaning it doesn’t run continuously when turned on. Big big upgrade from the regular 400P and I highly recommend this version. I think it is definitely worth the extra cost. This compressor is going to be kept in my Jeep for off-road adventures. Super happy with this upgrade.

Yes, this thing was made in China but what are we going to do, they all are. I have used this unit several times since I got it and it rides in my SUV everywhere. You can fill up truck tires and smaller items like bicycle tubes just fine. This model has auto shut off so you can use it by only squeezing the triggle, you don't have to keep turning the unit on and off. I like this because I can have the trigger part far away from the pump where the on off swicth is. The unit must be connect to a car battery to work. FYI> I contacted the company here in the USA and they said you "can't" make it run from a transformer if you want to rig it to work from a home recepticle. They also answered a number of other questions, were quick to reply to my email and seemed customer service oriented. I would recommend buying from this manufacturer. The unit seems of very good and solid quality. The hose disconnects from the trigger and from the pump so if you want to change the components out, you could. The triggle with the guage on it is quite nice and heavy and better than I thought it would be. The only complaints I have with it is, I wish I didn't have to have it attached to the car for operation. It would be great if I could plug it in to a wall receptical because it is so handy, quick and easy to use. I also have never been a fan of the type of valve that is used in this unit to attach it to a valve stem. There are only so many ways to do it but trying to hold the valve tightly enough on a stem while using a great deal of strength to flip the switch closed is something that has left me wanting since I was a kid trying to pump up my BMX tire. It works great, I just like the service station type valve better. Maybe it could be changed out later I guess. Overall good product, highly recommended.

I've already used this a few times and I love this thing. I have a full size compressor that I hated dragging out to put air in tires ( I bought the full size air compressor for nail guns and blowing out the pool lines). In the past few years I have bought less expensive mini air compressors for my tires and they have always been horrible, but they were also in the 50 dollar price range. Tires, especially in the winter need to be topped off and unfortunately my luck with nails in my tires has been horrible, ( I also travel with my own plug kit because of this) in the past year I've had to put a plug in both my wife and one of my tires. I keep it in my truck at all times and the piece of mind alone is worth it. Anyway to get to the point, I bought this one because of the quality, the standard quick connect fittings and most importantly, the trigger to start and stop the air on the fill side, meaning the air gun & gauge. This feature should be on all models if you ask me, yes it is worth it but missing from most travel compressors. So the quick rundown: it works really fast, it's not crazy loud, and the air hose reaches all the tires on my truck, so absolutely no complaints. The bag is sturdy and I see it lasting a long time, very easy to use and I hope it lasts forever. I love it. For anyone who cares, I also travel with a Noco boost, in case the battery should ever die on me, and I keep a quick connect attached to by battery at all times, so I don't have to use the alligator clips for the boost. (NOCO GBC009 Boost 18.5-Inch SAE Adapter Extension Cable For GB20/GB40/GB50 NOCO Boost UltraSafe Lithium Jump Starters) And then I bought an SAE cord, cut it , then I cut the cord to the alligator clip on the compressor and spliced in the SAE cord, also switched out the fuse to match the one on the compressor. So now when I need the compressor I just plug it into the quick connect instead of the alligator clips. I highly recommend this, especially if your battery, like mine ,is buried and you can't easily get to the terminals. - I am all about making life easier, especially if you are broken down on the side of the road.

I love this air compressor. The product I received is not exactly what was described. I contacted Viair, and found that I had received a newer model than described with the following differences: 1. The air hose is black, and an updated version. Very happy with this. 2. The gun is a 160psi gun, NOT 200psi. This change was made because 200psi is overkill for most people. I prefer the 160psi for my use, the dial is easier to read. I love it. I have a 2015 Jeep Wrangler Unlimited. This is a perfect compressor for my needs. It is extremely easy to set up and light to carry. The air hose has more than enough length, I can get to my spare without any pulling or stretching. The compressor is quiet and quick. Using the release valve in the gun, I deflated a tire to 20psi (very quickly, great valve). I then inflated it to 36psi in less than a minute. The compressor worked beautifully. It will automatically shut off if the trigger on the gun is not depressed for a few seconds, and start again when the trigger is depressed. This compressor comes with the filter assembly ready to attach. It is easy to put on, contains a 2 part filter already, and has two spare filter sets in a separate bag. The bag is extremely nice! Very rugged, and well balanced. The compressor seems very secure in the bag, and the hose fits perfectly up front. There are two small side pockets, one with a flap and one with velcro. There is no separate pocket for the gun, though. I wish they had included this. I will find a pouch to protect the dial. As important as all of the above: Viair customer service is amazing! The rep I spoke with was very friendly and knew absolutely everything about the product. She answered all my questions quickly and was a joy to speak with. I definitely recommend this compressor.

Review for the 400P-Automatic This refills each 285/70-17 tire from 15psi to 30 psi in just under 2 minutes. When comparing this to the Harbor Freight pump, it's much less noisy, more reliable, has a higher flow rate, and the auto shutoff feature saves quite a bit of running back and forth. After having to drive home on nearly flat tires when my Harbor Freight pump's reed valves failed (very common), I sprung for a more reliable Viair pump with some better features. •The pressure gauge is accurate once the pump shuts off (3-5 seconds after releasing the lever) •The battery clamps open wider than my previous pump and have less tendency to pop off •The hose is easy to pack and unpack and is of a much higher quality than the others I've used. •The flow rate is more than adequate for 33" tires. Of course it could be faster, when my fingers are freezing off, but that's part of the fun of snow wheeling. •The storage bag is appealing and holding up well. I do wonder if the Smittybilt ~5cfm pump would have been better, with its lower cost and higher output, but I'm on the quality over quantity train now., after being hosed by other cheap products.

I bought this to inflate a motor grader tire on my A-W 88H, and it worked flawlessly. I didn't time it,but maybe 15 or 20 minutes, to bring it from 20 up to 30 PSI (for transport). Also, the tire was about 1/3 buried .. right rear, so was struggling to free itself while raising out of being imprisoned. Indeed, it's a bit pricey, but they are the largest tires I have on any on my equipment here, so I am confident that this compressor will handle every thing else that might need some air while in a remote location. The hose got kinda warm, and the compressor outlet got too hot to touch, but the handle was fine, and the compressor itself was OK to touch, as well as the motor, this with ambient being about 90*f yesterday. Awesome little machine, and first class tote. Only complaint is the length of the gauge/trigger assembly was kinda short, but then, this is a very tall tire, and the valve stem was at 1 o'clock. So if you have tractors or trucks, I do recommend this compressor .. it should handle just about anything you can through at it. I should mention, that I used a for power Jump-N-Carry JNC660 1700 Peak Amp 12V Jump Starter rather than the grader's battery .. also highly recommended. The compressor was 100% un-starved for power. Cheers!

Super great product. If you are a four Wheeler off roader then you need to buy this immediately if not sooner. Gets my tires aired back up fast after I've needed to lower down the PSI in each tire. Has the power and functionality to get to pumping quick! Just open the hood, hook it up and you're gonna have full tire pressure quick. Fully recommend this and it has worked great since I've owned it. Still going strong in the durability and design looks like it will keep it going strong for many years. I'll never be stuck with low tire pressure or a flat again and I run 35s on 18 inch rims. Highly highly recommend buying this. It stays with my truck as a critical item and the inflation rate is better than most gas station air pumps

It is a great compressor. Reliable and fast. I use it when I go off roading to the desert (once every two weeks) and need to air down my stock tires (about 31 inch tires) on my 2019 TRD OR Tacoma. It takes me about 10-15 minutes to air up from 18 PSI to 40 PSI. The nice thing about the pistol you use to air up is that you can also use to air down!! Just connect it to the tire and press the trigger and it begins to release air while checking the tire pressure every few seconds with the gauge on the pistol. I absolutely love this thing. Oh and I also use it to help my friend air up his 33 inch tires after I have aired up mine, without having to wait for the compressor to cool down. The auto shut off mechanism is very nice to have because it automatically turns off when you're not airing up. This helps the compressor cool down and prevents over pressure from damaging the it. Well worth the money.

I wish all compressor had auto on/off. To use it, simply turn it on. It will pressurize the hose and will then turn off. Then you can pump the tires. As you pump (press the lever on the air chuck) the compressor detects a pressure drop, and turns on. Very cool. So you just leave it on, and once you are done with all tires you then turn it off. The hose is nice quality. Light. The connectors on hose are brass. The air chuck and gauge are heavy duty. You can use a third party one if you like. Standard 1/4 NPT connectors are used throughout. The unit is very quiet when running, and does not vibrate like crazy. Comes with a nice rubber pad under the metal plate. Comes with a handy bag. Overall very happy. Wish it was made elsewhere though, I would be willing to pay extra for that.

Perfect for my needs. I previously had an ARB dual compressor which I got included with a used vehicle purchase. Was going to transfer it over to my new Toyota tacoma, but it was just too large to fit anywhere. All the locations that it could be mounted either were planned for a different item. Under the hood where it could mount is the same place my second battery is going. Only other place would've been somewhere under the truck which I am not a fan of, or behind one of the back seats, but by doing so would lose the entire storage behind said seat. Was not prepared to do so, so sold the ARB and bought this. Sure its not going to fill my tires as fast. The ARB filled my 33" as fast if not faster than this fills my 32" tire on the truck. But its much more compact and its not significantly slower. I have no need to run air tools anymore so this works fine for my needs. Its also much smaller so I can put it behind the seat in the back along with plenty of other gear. At about 1/3 of the price, its more than enough for my needs. Took about 12min to air up from roughly 16PSI back to 30PSI on all 4 tires. My sleeping pad for camping is one of the self inflating as well so no need to inflate other stuff. If you need a 100% duty cycle for air tools and airing up beds and other inflatables like tubes for water sports, then the ARB is probably your better option. The Viair that's 100% duty cycle is complete garbage, as its CFM is way to low and you'll be there for almost 30min airing up tires. But if all you need is to inflate tires up to a 35" and maybe a soccer ball or something here and there this will do more than enough. This probably could inflate a mattress no problem as well, I just haven't had to so haven't tried it.

This pump is the perfect addition to my motorhome. Light weight, compact and easy to use, what more can you ask for. This has truly given me peace of mind on the road.

I had the 90P which being lighter was certainly more convenient to use. The 400P is bulkier but still quite okay. The high quality pump is definitely impressive. Very well built. The gauge is also quite bit better than the one with 90P. The coiled 1/4" air hose could be improved. I'm going to find a shorter, flexible, straight, standard hose so I don't have to use it. The valve clasp is very stiff making it hard to put on and difficult to remove. Don't see a fix for this. The carrying bag is really a nuisance. Looks fine but gets in way. Hard to believe a company as good as Viair would tolerate it. The automatic feature is nice and almost forgives all less desirable features.

I bought it to inflate 65 psi tires. A friend lent me a "motomaster" that said in the box that inflates 100 psi in 3 minutes when he saw that I decided to return the "viair" because the motomaster is cheaper and supposedly said that it does what I wanted, so I tried it, but when I used the motmaster I did not arrive to 52 psi, I could not inflate the tires of the trailer, However with viair without problem I decided not to return it of course. It is a product of good quality and it really does what it says inflates tireds of more than 65 psi, I am very happy. Thank you.