Linear Pneumatic Actuator Operating PSI Range 8 to 13 Max Air Pressure 25 psi Stroke 3 1/2 in Nominal Spring Range 8 to 13 psi Mounting Type Fixed Net Force Exerted @ 0 PSI 160 lb Net Force Exerted @ 18 PSI 83 lb Length 20 1/2 in Width 6 5/8 in Height 8 in Provides Control of Medium to Large Dampers For Use With Medium to Large Dampers Includes External Mounting Bracket Crank Arm Assembly and Positive Positioner