Siemens 331-4311 DAMPER ACTUATOR, PNEU NO 3, 2-3/8" STROKE, 3-7PSI, INTEGRAL PIVOT, PIVOT POSTSiemens 331 4311 Damper Actuator, Pneu No 3, 2 3 8" Stroke, 3 7psi, Integral Pivot, Pivot Post This 331 Number 3 Pneumatic Damper Actuator with integral pivot and pivot post is a rugged, metal fabricated device that provides gradual or positive actuation of HVAC dampers. This actuator has a nominal spring range of 3 to 7 psi, has extended shaft mounting and an ozone resistant rolling rubber diaphragm. This actuator has an air connection of 1 8" NPT
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Siemens 331-4311 DAMPER ACTUATOR, PNEU NO 3, 2-3/8" STROKE, 3-7PSI, INTEGRAL PIVOT, PIVOT POST