Schneider Electric (Barber Colman) MK4-3121 Pneumatic Damper Actuator, 8 to 13 Psi Spring Range, Positive Positioner ( Adjustable 2 to 10 Psi ), 2" to 4" Adjustable Stroke, Spring Retracts Actuator Shaft on Loss of Air Pressure, 30 Psig Maximum Air Pressure, 1/8" Fnpt Air Connections

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