Pneumatic Variable Volume Damper Actuator, Low Actuator Force, Spring Return, Barbed Fitting for 1/4" OD Plastic Tubing, 30 PSI Maximum Operating Pressure, 5-10 PSI Spring Range, Includes 90 Degree Angled Mounting Bracket and 3/8" Threaded Shaft , 50-140 Degree Temperature Range, 5-95% RH Humidity Range, 2.2 Square Inch Diaphragm