Siemens 331-3018 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 3-13PSI, FIXED MOUNT PLATESiemens 331 3018 Damper Actuator, Pneu No 4, 4" Stroke, 3 13psi, Fixed Mount Plate This 331 Number 4 Pneumatic Damper Actuator with a ball joint connector is a rugged, metal fabricated device that provides gradual or positive actuation of HVAC and fire smoke dampers. This actuator has a nominal spring range of 3 to 13 psi, a fixed mounting plate and a replaceable diaphragm. This actuator has an air connection of 1 8" NPT female with a dual barb elbow
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Siemens 331-3018 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 3-13PSI, FIXED MOUNT PLATE