Differential Pressure Regulator Lrll-3/8-QS-12 without Manometer, with Male Thread and Qs Plug Connector. Controller Function= (* Differential Pressure, Constant, * with Return Flow) , Pneumatic Connection, Port 1=G3/8, Pneumatic Connection, Port 2=Qs-12, Mounting Type=Threaded, Nominal Flow Rate Open=518 L/Min, Festo