One-Way Flow Control Valve Grla-1/4-Pk-4-B Valve Function=One-Way Flow Control Function for Exhaust Air, Pneumatic Connection, Port 1=Male Thread G1/4, Pneumatic Connection, Port 2=For barbed Connector Internal Diameter 4 Mm with Nut, Adjusting Element=Slotted Head Screw, Mounting Type=Threaded, Festo