Flow Control/Silencer Gru-1/2-B Flow Control Valve with Integrated Silencer for Exhaust Air Flow Control with Certain Designs of Valves. Valve Function=Sound pressure control function, Pneumatic Connection, Port 1=G1/2, Adjusting Element=Slotted Head Screw, Mounting Type=Threaded, Standard Flow Rate 6 -> 0 bar=0 - 4000 L/Min, Festo