Differential Pressure Regulator Lrll-1/8-QS-4 without Manometer, with Male Thread and Qs Plug Connector. Controller Function= (* Differential Pressure, Constant, * with Return Flow) , Pneumatic Connection, Port 1=G1/8, Pneumatic Connection, Port 2=Qs-4, Mounting Type=Threaded, Nominal Flow Rate Open=100 L/Min, Festo