121-6002, Festo, Festo QSM Series Reducer Nipple, Push In 6 mm to Push In 4 mm, Tube-to-Tube Connection Style, 153327, Brand Festo, Connector A Push In 6 mm, Connector B Push In 4 mm Festo QSM Series Reducer Nipple, Push In 6 mm to Push In 4 mm, Tube-to-Tube Connection Style, 153327