Pneumatic Damper Actuator; Type Spring Return; Mounting Type Versatile; Bore Size 6-5/8 Inch; Overall Size 6-5/8 Inch Diameter x 18-1/4 Inch Length x 6-7/8 Inch Height; Stroke Length 3-1/2 Inch; Pressure Rating 29 PSI; Body Material Deep Drawn Aluminum; Spring Range 3 to 13 PSI; Temperature Rating -40 to 158 Deg C; Humidity 5 to 95 Percentage RH; Air Connection Size 1/4 Inch (Barb Fitting)