Key Specifications / Parameters Part Number: 2E859702202 Product Type: Diaphragm (actuator component) Compatible Actuator Model: Fisher Model 657, Size 60 Material: Nitrile (NBR) elastomer Diameter: ~18.625 inches (18‑5/8″) Hole Count: 24 mounting holes Application: Used to actuate sliding‑stem control valves by converting air pressure to mechanical movement through the actuator diaphragm