One-Way Flow Control Valve Grla-1/4-Rs-B with Knurled Screw and Lock Nut Valve Function=One-Way Flow Control Function for Exhaust Air, Pneumatic Connection, Port 1=Male Thread G1/4, Pneumatic Connection, Port 2=Female Thread 1/4, Adjusting Element=Knurled Screw, Mounting Type=Threaded, Festo