Pneumatic Variable Volume Damper Actuator, Low Actuator Force, Spring Return, Barbed Fitting for 1/4" OD Plastic Tubing, 30 PSI Maximum Operating Pressure, 3-13 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

Pneumatic Damper Actuator, High Actuator Force, Spring Return, 3 1/2" Stroke, 5-95% RH Humidity Range, 25 PSI Maximum Operating Pressure, 5/32" Push on Barb For Pilot, 1/4" Push on Barb for Main, 10 PSI Positive Positioner Span ( 5 PSI Spring included ), -20-158 Degree Temperature Range, Includes External Trunnion Mounting Bracket with Crankarm