Schneider Electric (Barber Colman) MK-3121 Actuator

Pneumatic Damper Actuator, 8 to 13 Psi Spring Range, 2" to 4" Adjustable Stroke, Spring Retracts Actuator Shaft on Loss of Air Pressure, 30 Psig Maximum Air Pressure, 1/8" Fnpt Air Connections

MK-3121 is the direct replacement for MK-3121-110, MK-3121-115, MK-3221