Quick connector CK-1/8-PK-4 Male thread with sealing ring, metal version. Nominal size=2,9 mm, Type of seal on screw-in stud=Sealing ring, Assembly position=Any, Operating medium=(* Compressed air in accordance with ISO8573-1:2010 [7:-:-], * Water as per manufacturer's declaration at www.festo.com), Note on operating and pilot medium=Lubricated operation possible