Johnson Controls V-3801-8001 Actuator

Proportional Control, Spring Return, Linear Movement, Max 30 PSI Control Pressure, Pneumatic Valve Actuator (4 square inch) with 1/4" or 5/32" OD Barbed Air Connection (3-6 PSI, 4-8 PSI, or 9-13 PSI range depending on Spring Kit used) (Spring Kit Not Included)