Ring piece TK-1/8-PK-4 With 2 sealing rings. 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), Maritime classification=see certificate, Pneumatic connection, port 2=for barbed connector internal diameter 4 mm with nut, Materials note=Conforms to RoHS