Linear Pneumatic Actuator Operating PSI Range 3 to 13 Max Air Pressure 29 psi Stroke 3 1/2 in Nominal Spring Range 3 to 13 psi Mounting Type Fixed Net Force Exerted @ 0 PSI 50 lb Net Force Exerted @ 18 PSI 89 lb Length 18 1/4 in Width 6 5/8 in Height 6 7/8 in Provides Control of Medium to Large Dampers For Use With Medium to Large Dampers Includes External Mounting Bracket and Crank Arm Assembly