: If the item is a proportional pressure regulator (often associated with similar codes), you can browse the Festo Spare Parts Catalogue Can you provide the 6-7 digit part number 11-character Product Key from the device label? Downloads and documentation | Festo USA
[Insert actual link to the manual PDF]
Good luck, and may your machines run smoothly! festo rrftokc2018 manual pdf link
Here is the story of this component and how to find its documentation: The "Silent Conductor" of the Assembly Line : If the item is a proportional pressure