We bought this for a truck to inflate tires after off-road use. We drop tires at 20psi each. When we tried to inflate the compressor again, it started smoking. The outlet valve is made of plastic. After warming up after pouring the first 2 tires, the plastic melted and failed to form a seal around the exhaust valve. I felt that it took longer than usual to fill up the tire. When I went to check the tire, the device smoked and could not inflate the tire. This works in a pinch for a bus, but if you intend to use this regularly it won't. Also, the cable that came with it wasn't long enough to reach the rear wheels without extending it.