Ring Piece Tk-1/4-Pk-4 with 2 Sealing Rings. Maritime Classification=See Certificate, Operating Medium=Compressed Air In Accordance with Iso8573-1:2010 (7:-:-), Note On Operating and Pilot Medium=Lubricated Operation Possible (Subsequently Required for Further Operation) , Pneumatic Connection, Port 2=For barbed Connector Internal Diameter 4 Mm with Nut, Materials Note=Conforms to Rohs