12 Volt Air Compressor, Portable Air Pump, Tire Inflator 150 PSI, Air Compressor by SuperFlow for Cars, Trucks, RVs, and Bikes

I just used it for the first time to add 3-4 psi to each of my Ford Ranger tires. It's cold here, so I trickle charged my battery before and after. Also checked that the air hose screwed onto my tire stems before unpacking the entire unit.Briefly, it worked fine. I followed the instructions and started the unit before screwing the air hose to a tire, then left it running until I had finished with all 4 tires and disconnected the hose from the last tire. The gauge is off by 5 psi but consistent; I need it to read 35 psi to get the 30 psi I'm looking for.If it fails next time I'll let you know, but for now I'm very satisfied.

I have been using the MV50 model for a few years now for my truck when off-road and loved it. I bought one of this model (HV40A2) for use in my car. Worked as well as my larger model and I was impressed enough to buy one for both my son and his best friend to keep in their cars. It is a reliable tool and much better than any of the plastic body pumps you might find at wally world. Use this size for a normal passenger car, the MV50 for most SUVs and the MV90 for larger SUV or truck tires.

The second time I used the compressor it stopped functioning properly. I am now trying to return it and will not buy another. I received a replacement unit for free, it was also defective, I received a third unit free and have been using it every since. It works great. The customer service was excellent!! I wouldn't hesitate to buy a replacement.

The max amperage of the HV-40A2 is specified as 15 A, both on the SuperFlow website and on the pump itself. However, the pump I received exhibited an inrush current in excess of 15 A. The result was that the pump blew the 15 A fuses on both of the power outlets in my car. The battery is fully charged to 12+ volts so that's not the problem, either. I had been impressed with my dad's SuperFlow HV-40. It's a quiet but powerful pump, and it's never exceeded its 15 A rating. It seems either I got a bad apple or there is some additional current draw on the HV-40A2 due the LED light circuit. And no, I wasn't trying to turn on the pump and the LEDs simultaneously---though I'd expect to be able to do that, too. Hopefully Amazon will restock the HV-40 soon.

The unit operates as advertised. It is light weight, very portable and inflates SUV, car and bike tires very quickly. The problem I am having is with the screw on hose connection to the tire's valve stem. I am never (and I mean never) able to screw the end of the air hose onto any SUV, car or bike tire's valve stem. It simply won't screw on. I therefore need to manually hold the end of the hose onto the valve stem to inflate a tire. I need to hold it in the exact proper position or the air will quickly leak out of the tire. Frustrating to say the least. There have been times when I thought the tire was inflating to find out that I didn't have it in the proper position and the tire was actually deflating.I just sent an email to Q Industries to find out if the "Optional clip on tire valve inflator extension" that Q Industries sells on their website for $5, will work with the HV402A that I purchased. If this won't work, I am hoping they can provide another alternative.If they don't make a different adapter or hose for this unit that actually works, I will need to deem the HV402A useless and find another portable air compressor. And that's a shame considering I spent $50 to buy this unit and it's only a few months old.

I bought this to keep in my car to keep my tires at a specific pressure. I am happy with my purchase and have nothing bad to say about this. Definitely worth the money.

My second Portable air compressor. Use exclusively for auto tires. Works fine and easy to use. However, the power plug-in fitting to the first was pretty cheap plastic. Went to use one day and found out was broken. Perhaps being kept in a hot N Texas garage weakened the plastic. No idea what caused it to break. Just pulled out to use found badda-boom/badda bing, it was broke. Not fixable. At the price though, I decided to buy the same model, keep it inside and see if it does better.

Great pump inflates my truck tire in 5 min.The light was great to have at night plus the easy to read gauge on top.I purchased the extension cord and it really helped.