The price is per unit not for all 4 I do have 4 available for sale Devilbiss Air Adjusting Valve with Gauge is a single item automotive tool designed by the reputable brand DeVilbiss. This product, with the manufacturer part number HAV-501, allows for precise air adjustments in automotive systems. The built-in gauge ensures accurate readings for optimal performance, making it a valuable tool for automotive maintenance and repair tasks.hh
