Robinair AC Manifold gauge set was originally for R12, it has been adapted for 134A

To properly diagnose an AC system the use of a manifold gauge set is needed. AC gauge pressure readings help professional auto technicians determine if the system is low and exactly what is going on with the car’s A/C system. A 134A gauge set is also used when attaching a vacuum pump to the car for evacuating/removing the air out of AC components. If air is left in the system, the moisture it contains combines with refrigerant under pressure can cause a corrosive acid to form that can destroy evaporators, condensers or even the AC compressor from the inside.

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