Accessories Darq-K-40-F04-S11-R1 For Connection Of Actuator And Process Valve. Size=40, Corrosion Resistance Classification Crc=3 - High Corrosion Stress, Materials Note= (* Contains Pwis Substances, * Conforms To Rohs) , Material Coupling=High Alloy Steel, Material Mounting Adapter=High Alloy Steel, Non-Corrosive, Festo