Maybe this item I got might have a defect.It works but the more you crank up the knob to boost air, the harder to turn the knob all the way to MAX PSI.Closing the air regulator from MAX is difficult to get it started to turn it off.I had has to take a pair of Pliers to get it started and end up breaking the knob.Overall, end up replacing it with another brand.Only used it for 2 months. Return period expired.It is in-expensive and not worth returning.
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