Pneumatic Damper Actuator, High Actuator Force, Spring Return, 3 1/2" Stroke, 5-95% RH Humidity Range, 29 PSI Maximum Operating Pressure, 1/4" Barbed Fitting for OD Plastic Tubing, 8-13 PSI Spring Range, -40-158 Degree Temperature Range, Includes Internal Normally Closed Trunnion Mounting Bracket with Pushrod