Product details : FESTO 578797 ONE-WAY FLOW CONTROL VALVE
one-way flow control valve VFOH-LE-A-G18-Q4 Valve function=One-way flow control function for exhaust Air, Pneumatic Connection, port 1=QS-4, Pneumatic Connection, port 2=G1/8, Type of actuation=manual, Adjusting element=External Hex