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This pressure is controlled by the regulator and is always less than or equal to the tank pressure. Tank Pressure Gauge:The tank pressure gauge indicates the reserve air pressure in the tank. Regulator:Controls the air pressure shown on the outlet pressure gauge. Pull the knob out and turn clockwise to increase pressure and counterclockwise to decrease pressure. When the desired pressure is reached push knob in to lock in place. Drain Valve:The drain valve is located at the base of the air tank