Pneumatic Coil Valve Actuator, Direct Acting, 4-11 PSI Spring Range, 3/4" Stroke, Spring Return, Dual Barbed Fitting for 5/32" or 1/4" OD Plastic Tubing, Provides Proportional Control of Steam or Hot Water or Cold Liquids in Hvac Systems, 0-140 Degree Temperature Range, 5-95% RH Humidity Range, 25 PSI Maximum Operating Pressure, Inclides Positive Positioner with 10 PSI Span and Stem Extension Assembly, High Actuator Force