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Port Size: 1/4" Inch BSPP Female Port w/ NPT fittings (Teflon Tape or thread sealant must be used) / Port Description - P: Pressure Source, A: Output at Rest, B: Output, Pedal Depressed / Port Function - Rest (Pedal Up): P connected to A, B Vented, Pedal Depressed: P connected to B, A Vented / This foot operated air valve is ideally suited to control 2 port pneumatic cylinders allowing pressurized extension and retraction or bi-directional pneumatic motors allowing control in forward and reverse. It may also be used for simple on-off or off-on control of an air source by only using one of the output ports.