Differential Pressure Regulator Lrll-1/4-QS-10 without Manometer, with Male Thread and Qs Plug Connector. Controller Function= (* Differential Pressure, Constant, * with Return Flow) , Pneumatic Connection, Port 1=G1/4, Pneumatic Connection, Port 2=Qs-10, Mounting Type=Threaded, Nominal Flow Rate Open=269 L/Min, Festo