VIAIR300P - 30033 Tire Inflator Portable Offroad Air Compressor for Truck & SUV, 12V On/Off Road Tire Pump Air Compressor Portable Heavy Duty 150 PSI

This is a serious work horse. My hotdog compressor is rated for 150psi but can't inflate my 110psi fifth wheel tires! This little unit brought all four tires up to the recommended pressure in about ten minutes. It runs on 12volt power with big clamps directly to the battery so it works anywhere. It clamps onto the valve stem so you don't need bionic fingers to hold it on. It does get hot, but not dangerously. Highly recommend this for RV travel and nearly unlimited other uses.

I regularly go off-roading in California's deserts and wanted a reliable way to add pressure to my tires when returning to the pavement, and to reinflate tires after a repair. I purchased this compressor in 2010 after my cheap, barely adequate $25 "tire inflator" from a department store chain stopped working. I have had zero problems with my Viair.Uses:In addition to the uses above, I use the compressor every couple of weeks to top up one of my tires that has a slow leak. I just used it to quickly top up the tires on my wife's van. I have also used it to inflate my kid's wading pool via an extra attachment that came with our bicycle pump.Pros:Well made and reliableEasy to connect to the red battery terminal and ground via the alligator clipsPositive latching on to the tire stemPretty fast inflating of even large tiresConsistent readings from the integral tire gaugePacks up into a relatively small package that can stay in any vehicle 24/7Carrying case is handy and makes storage easyCons:Gets warm after a couple of tires and needs to cool off before packing it upThe coiled hose offers a lot of resistance, making reaching the last tire a struggleGetting the compressor back into its case takes a little workBottom line:Good piece of gear at a fair price point. An additional bonus is that I can forever skip the quarter-fed, nasty gas station air stations that seems to pump as much moisture into my tires as air.

Love my Viair 300p. Inflates my truck tire to 80 psi in minutes. I have a toyhauler and needed to air up one of the tires from 70 to 110 psi and it was done in just minutes no problem.I would recommend to anyone.

I wanted a portable, reliable, high quality, quick & powerful tire inflator. This product has all of those qualities in spades! It is probably way more compressor than I need for my three passenger vehicles: a small commuter car, a minivan and a full size van. This obviously durable product comes with a quality carrying/storage case. It inflates fast! Do not walk away from this product while it is in use (there is no auto-shutoff and, again, for normal size passenger tires it will quickly raise pressure). It is also surprisingly quiet while operating compared to the cheap inflator I purchased at Lowe's (two of which broke down on me in as many years, which prompted my search for a quality product).This is easily a 4.5 star product, but I'm consciously choosing to not round up to 5 stars because there are some design flaws that should be addressed:1) The 25' long extension coil hose that comes included is really only going to give you 12 feet or so of working distance (i.e. for those working solo). You won't be comfortable stretching the coil out all the way. Even if you tried, the tension would cause the portable compressor to be dragged around on the ground. You can get further distance with a second person - one to hold & operate the compressor and one to attach the tire chuck & read the pressure gauge (keeping hold of the coil to relieve tension from the tire valve). I understand that these coiled hoses are designed to operate this way, but ideally the power cord, the coiled hose itself, or both would be longer. The easiest solution would be to double the length of the power cord - it is not bulky and the carrying case would easily accommodate the added length. The current design is unable to reach from my full-size van's battery to the opposite rear tire. Another reviewer provided the ingenious solution of using jumper cables to extend the working distance of the portable compressor - it was a brilliant suggestion that worked perfectly for me!2) Oddly, the clamp-on tire chuck ("lever style tire chuck") is a bit deep. What I mean is that the tire valve must be inserted into the chuck quite far for it to engage properly to allow air flow. I purchased this particular Viair model in large part because I wanted the clamp-on style chuck versus a screw-on connection. Unfortunately, my van has chrome valve stems (see picture) that are beveled just enough, such that I cannot get the tire chuck on far enough to properly engage. My solution was to purchase an adapter (Fafada® Motorcycle Motorbike Tyre Valve Extender Adapter Car Bike 2 Pcs/Pair (90 Degree)), but that means I'm back to a screw-on connection. Too bad - it seems like being able to insert the entire threaded portion of the Schrader valve into the tire chuck should be enough, but it's not.3) One must turn the compressor off to get an accurate tire pressure reading. The power switch is, naturally, on the compressor, but the pressure gauge is way over at the tire. The whole 25' coil is pressurized at the same pressure as the tire. It would make more sense to install the gauge at the end of the coil that attaches to the compressor (where the on/off switch is). This would make for better control and easier monitoring. A longer hose or power cord as discussed above would make this a non-issue.The three flaws above are the difference between an excellent product and a perfect product. While they prevent me from giving a perfect 5 star rating, they should not deter anyone from purchasing this excellent portable compressor.

I bought this portable pump about 3 years ago for fixing flats on the road. I keep it stowed in my truck under the back seat. It has worked very well. Its convenient enough that I use it at home to maintain tire pressure in all of our vehicles. Its been a reliable tool with good build quality.Good to know:The pump gets hot for a bit, so you need to let it cool before re-stowing it.If you have a lifted truck the power cables might not allow the pump to reach the ground.The pressure gauge only reads when the unit is off. That makes for a little back and forth when you want to check progress. Not hard to let out excess pressure, though.

the unit works perfectly for inflating tires.I use this on my old pickup that has aluminum wheels and being 10 years old tends to lose air. I could replace tires and maybe that would solve it (but the tires are in very good shape) and then after replacing them find it is the wheels... in either case not worth investing in... easier to use this [excellent] 12v tire pump. will also move it to the RV when that is being used (just in case there is a problem).By all means, this unit pumps up the 16 or 18 inch tires from 25 or 26 lbs to 44 lbs pretty quick. Nice feature is the pressure gauge is near the inflation end... easy reading. Comes with all the ends you might need... if you are looking at a portable 12v air compressor... look closely at this one

It's affordable. Works great. Used it for 5 weeks travelling, almost daily on trails. Took me 12 min to air up from 22 PSI back to 33 PSI all 4 tires.It's not super fast, and 1 hose, but at that price it's great for what it is. It's light weight and compact.