TCP Global SPRAY GUN AIR REGULATOR w-GAUGE-Auto Car Paint-Hvlp, (1/4" NPT) Provides precise air control for even spray! Air Adjustment Range: 0-180 PSI (1-12 Bar) Diaphragm Control: Diaphragm automatically adjusts to pressure fluctuations maintaining an even gun spray Locking Air Adjustment Knob for Precise Air Control in the 15 -60 PSI range "Where it's really needed" Fine Metering Control: Allows for more accurate tuning of the gun's spraying pressure for better pattern control