Matt Savage VIAIR 450P-RV Automatic Portable Compressor Kit (12V, CE, 100% Duty, 150 PSI)

When we bought our Ford F-350 Dually and a fifth wheel trailer, I bought a CAD$80 (~USD$60) dual 12/120v air tire inflator. The first time we needed to use it, we found out how slow it was. We needed to raise the air pressure in our four big trailer tires from about 90 psi to 110 psi, with one tire at just 57 psi. It took nearly a half hour to do this, and was so slow that I settled for just 100psi--our friends were waiting for us to finish before we left the meeting point and headed on our way. I was determined not to repeat that frustrating experience. My next purchase was a much faster 12v tire inflator for about CAD$150 (~USD$112). It was much faster and certainly addressed the frustration problem. However, after about an hour's total use, the plastic part that clamps on the valve stem blew off the end of its hose. I was able to get a free replacement under warranty, but after a mere half-hour of use, that one started blowing its fuse every time I used it, rendering it useless. So, I decided that I had to find one that was highly rated and would last. After my experiences with these other ones, I was willing to pay for a good quality tire inflator. Well, the Viair 450P-RV is exactly what I was looking for. It comes with all the attachments you need. It has a long coiled hose and a second extension coiled hose so that you can have the compressor near the front of the truck or trailer to reach the battery in either one yet still be able to reach back to the tires. I was even able to use the battery in my truck and reach all the way back to the trailer tires on our 36-foot fifth wheel. Overall, we're very happy with it. One caveat--we've only got about an hour's use on it so far. From all the reports I've read, it's very reliable so I'm not worried about that at all. However, I can't personally testify to its longevity. A great product, and I really wish we'd bought it much earlier!

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Ordered it to put air in my boat trailer tires, they are large 16" that run 80-90 psi, have always had trouble getting them filled, you can't get the trailer into most air hoses, and even if you do they don't have the pressure. Hooked this thing up, you turn it on, it comes up to pressure and shuts off, then squeeze the trigger to put air in and it kicks right off, was able to bring the tires up to 90 psi in just a few minutes each. Not starting from scratch, they already had just over 80 psi, but it is always that last bit to get them up to 90 that is so hard. This thing just pumped them right up, it is very quiet, doesn't vibrate around at all, just sits there and hums and away you go. It gets warm, but it wasn't excessive, just a few minutes and I could put it back in the case. I will say the case is very nice, holds the compressor and two extension hoses that are high quality, but it takes up a lot of room. Not sure how to best carry it in my truck.

I didn’t really want to spend this much money on an air compressors for tires but it’s worth it not to have to drag truck and camper into tight places to fill tires you can just do it before you hit the road. Deff a must have.

I have several VIAIR pumps. Unfortunately the last one was stolen. I believe this one will be my favorite for the following reasons. Number one is the auto shut off. Many units require that you return to the pumps to shut it off. In the past I would over fill the tire, return to the pump, shut it off and then return to the tire and reduce air to the proper pressure. Doable but extra effort. Number two is the continuous run cycle. Many units can run for 15 minutes then require a 30 minute cool down time. While maybe not important to some why risk it and have the auto thermal protection shut it down and wait 30 minutes. As an added bonus I suspect to get the continues run time the rpms on the motor have been reduced and the unit is pretty quiet. Number three the supplied air gun has a bleed off button which allows you to reduce air pressure easily if you over fill. Number four the unit comes with two hoses, the extension for dully tires and the air gun with gage so you are ready for most anything. Number five the whole package is small enough to fit under most SUV's back seat. It is high quality and not cheap like some you see in some discount stores and gives you a "get to the tire store" back up as well as avoids you having to locate a gas station with an air pump, chunk in quarters and hope it works for a simple air top off. About the only downside I can see is because the gage goes to 170 if you routinely fill passenger 32 LBS tires you may want to add a smaller scale gage for a bit more accuracy. My package also came with the screw on valve connection. Very solid but if you do a lot of tires the "flip down" one would be quicker. It is available separately. Note the hoses I got were black which I prefer.