One-Way Flow Control Valve Grlz-1/4-Pk-4-B for Supply Air Flow Control, with Swivel Joint. Valve Function=One-Way Flow Control Function for Supply Air, Pneumatic Connection, Port 1=Male Thread G1/4, Pneumatic Connection, Port 2=For barbed Connector Internal Diameter 4 Mm with Nut, Adjusting Element=Slotted Head Screw, Mounting Type=Threaded, Festo