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Port Size: 1/4" NPT, 1/8" NPT Female Vent / Port Description - IN: Pressure Source, OUT: Output, Pedal Depressed, 1/8" Not Marked: Exhaust / Port Function - Rest (Pedal Up): IN off, OUT Exhausted , Pedal Depressed: IN connected to OUT / This foot operated air valve is ideally suited to control spring or loaded return pneumatic cylinders allowing pressurized extension and vented retraction or single-directional pneumatic motors allowing control only in a single direction. It may also be used for simple on-off or off-on control of an air source.