VIAIR 300P - 30033 Tire Inflator Portable Offroad Air Compressor for Truck & SUV, 12V On/Off Road Tire Pump Air Compressor Portable Heavy Duty 150 PSI

Great Little compressor so far. I used it multiple times at the OBX to air up, it worked great, took about 1.5-2 min per tire if aired down to 18psi, honestly a little faster then some of the gas stations. It will get quite hot if run continuously, so I'd do a tire or two then let it sit a couple min before finishing. cables where plenty long enough to reach the back tires for the 4 door with 6.5' bed. Its nice and compact, i keep it stored under the back seat.

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 was wanting a better quality tire inflator to carry in my Travel Trailer. It had to easily inflate my trailer tires that are rated for 80psig. I read over the reviews of several inflators and decided on the 300P. Put it to the test yesterday. I am very pleased. Had no problem handling the 80psi tires. Pumped one that was at 70 psi up to 80 in about 65 seconds. The battery clips are plenty large enough to grab onto a battery post connector. My trailer batteries are located front underside of my 34 foot 5th wheel center compartment.With electric wire and coil air hose, I reached tires with no excessive stretching. The air hose to valve stem clamp is very good and tight. No air loss and would be much easier than the screw on fittings others come with. This unit also has the "Air release" feature to let out excess pressure. The air gauge is a good quality. The pump is much quieter than I thought it would be. Comes with a very good carrying bag that has room to include any special fittings you may need. I did have my trailer plugged into electric power when using the inflator. The write up on it stated to have vehicle running while using. This is to give the 12V a little extra boost. This is understandable. The in-line electrical fuse would make it very easy to replace fuse if needed. I will be buying an extra fuse to carry just in case.

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.